[DOC] Use simple references to operator methods

Method references is not only able to be marked up as code, also
reflects `--show-hash` option.
The bug that prevented the old rdoc from correctly parsing these
methods was fixed last month.

array.c

@@ -8193,9 +8193,9 @@ rb_ary_deconstruct(VALUE ary)
  *  - #hash: Returns the integer hash code.
  *
  *  === Methods for Comparing
-
+ *
- *  - {<=>}[#method-i-3C-3D-3E]: Returns -1, 0, or 1
+ *  - #<=>: Returns -1, 0, or 1 * as +self+ is less than, equal to, or
- *    as +self+ is less than, equal to, or greater than a given object.
+ *    greater than a given object.
  *  - #==: Returns whether each element in +self+ is <tt>==</tt> to the corresponding element
  *    in a given object.
  *  - #eql?: Returns whether each element in +self+ is <tt>eql?</tt> to the corresponding
@@ -8277,12 +8277,12 @@ rb_ary_deconstruct(VALUE ary)
  *
  *  === Methods for Combining
  *
- *  - {&}[#method-i-26]: Returns an array containing elements found both in +self+ and a given array.
+ *  - #&: Returns an array containing elements found both in +self+ and a given array.
  *  - #intersection: Returns an array containing elements found both in +self+
  *    and in each given array.
  *  - #+: Returns an array containing all elements of +self+ followed by all elements of a given array.
  *  - #-: Returns an array containing all elements of +self+ that are not found in a given array.
- *  - {|}[#method-i-7C]: Returns an array containing all elements of +self+ and all elements of a given array,
+ *  - #|: Returns an array containing all elements of +self+ and all elements of a given array,
  *    duplicates removed.
  *  - #union: Returns an array containing all elements of +self+ and all elements of given arrays,
  *    duplicates removed.

hash.c

@@ -7063,11 +7063,11 @@ static const rb_data_type_t env_data_type = {
  *
  *  ==== Methods for Comparing
  *
- *  - {<}[#method-i-3C]: Returns whether +self+ is a proper subset of a given object.
+ *  - #<: Returns whether +self+ is a proper subset of a given object.
- *  - {<=}[#method-i-3C-3D]: Returns whether +self+ is a subset of a given object.
+ *  - #<=: Returns whether +self+ is a subset of a given object.
  *  - #==: Returns whether a given object is equal to +self+.
- *  - {>}[#method-i-3E]: Returns whether +self+ is a proper superset of a given object
+ *  - #>: Returns whether +self+ is a proper superset of a given object
- *  - {>=}[#method-i-3E-3D]: Returns whether +self+ is a proper superset of a given object.
+ *  - #>=: Returns whether +self+ is a proper superset of a given object.
  *
  *  ==== Methods for Fetching
  *

numeric.c

@@ -975,14 +975,14 @@ num_negative_p(VALUE num)
  *
  *  === Comparing
  *
- *  - {<}[#method-i-3C]: Returns whether +self+ is less than the given value.
+ *  - #<: Returns whether +self+ is less than the given value.
- *  - {<=}[#method-i-3C-3D]: Returns whether +self+ is less than or equal to the given value.
+ *  - #<=: Returns whether +self+ is less than or equal to the given value.
- *  - {<=>}[#method-i-3C-3D-3E]: Returns a number indicating whether +self+ is less than, equal
+ *  - #<=>: Returns a number indicating whether +self+ is less than, equal
  *    to, or greater than the given value.
  *  - #== (aliased as #=== and #eql?): Returns whether +self+ is equal to
  *    the given value.
- *  - {>}[#method-i-3E]: Returns whether +self+ is greater than the given value.
+ *  - #>: Returns whether +self+ is greater than the given value.
- *  - {>=}[#method-i-3E-3D]: Returns whether +self+ is greater than or equal to the given value.
+ *  - #>=: Returns whether +self+ is greater than or equal to the given value.
  *
  *  === Converting
  *
@@ -991,7 +991,7 @@ num_negative_p(VALUE num)
  *  - #**: Returns the value of +self+ raised to the power of the given value.
  *  - #+: Returns the sum of +self+ and the given value.
  *  - #-: Returns the difference of +self+ and the given value.
- *  - {/}[#method-i-2F]: Returns the quotient of +self+ and the given value.
+ *  - #/: Returns the quotient of +self+ and the given value.
  *  - #ceil: Returns the smallest number greater than or equal to +self+.
  *  - #coerce: Returns a 2-element array containing the given value converted to a \Float
       and +self+
@@ -3510,30 +3510,30 @@ rb_num2ull(VALUE val)
  *
  * === Comparing
  *
- * - {<}[#method-i-3C]: Returns whether +self+ is less than the given value.
+ * - #<: Returns whether +self+ is less than the given value.
- * - {<=}[#method-i-3C-3D]: Returns whether +self+ is less than or equal to the given value.
+ * - #<=: Returns whether +self+ is less than or equal to the given value.
- * - {<=>}[#method-i-3C-3D-3E]: Returns a number indicating whether +self+ is less than, equal
+ * - #<=>: Returns a number indicating whether +self+ is less than, equal
  *   to, or greater than the given value.
  * - #== (aliased as #===): Returns whether +self+ is equal to the given
  *                           value.
- * - {>}[#method-i-3E]: Returns whether +self+ is greater than the given value.
+ * - #>: Returns whether +self+ is greater than the given value.
- * - {>=}[#method-i-3E-3D]: Returns whether +self+ is greater than or equal to the given value.
+ * - #>=: Returns whether +self+ is greater than or equal to the given value.
  *
  * === Converting
  *
  * - ::sqrt: Returns the integer square root of the given value.
  * - ::try_convert: Returns the given value converted to an \Integer.
  * - #% (aliased as #modulo): Returns +self+ modulo the given value.
- * - {&}[#method-i-26]: Returns the bitwise AND of +self+ and the given value.
+ * - #&: Returns the bitwise AND of +self+ and the given value.
  * - #*: Returns the product of +self+ and the given value.
  * - #**: Returns the value of +self+ raised to the power of the given value.
  * - #+: Returns the sum of +self+ and the given value.
  * - #-: Returns the difference of +self+ and the given value.
- * - {/}[#method-i-2F]: Returns the quotient of +self+ and the given value.
+ * - #/: Returns the quotient of +self+ and the given value.
  * - #<<: Returns the value of +self+ after a leftward bit-shift.
  * - #>>: Returns the value of +self+ after a rightward bit-shift.
  * - #[]: Returns a slice of bits from +self+.
- * - {^}[#method-i-5E]: Returns the bitwise EXCLUSIVE OR of +self+ and the given value.
+ * - #^: Returns the bitwise EXCLUSIVE OR of +self+ and the given value.
  * - #ceil: Returns the smallest number greater than or equal to +self+.
  * - #chr: Returns a 1-character string containing the character
  *   represented by the value of +self+.
@@ -3553,7 +3553,7 @@ rb_num2ull(VALUE val)
  * - #to_s (aliased as #inspect): Returns a string containing the place-value
  *   representation of +self+ in the given radix.
  * - #truncate: Returns +self+ truncated to the given precision.
- * - {|}[#method-i-7C]: Returns the bitwise OR of +self+ and the given value.
+ * - #|: Returns the bitwise OR of +self+ and the given value.
  *
  * === Other
  *
@@ -6119,7 +6119,7 @@ int_s_try_convert(VALUE self, VALUE num)
  *
  * === Comparing
  *
- * - {<=>}[#method-i-3C-3D-3E]: Returns:
+ * - #<=>: Returns:
  *
  *   - -1 if  +self+ is less than the given value.
  *   - 0 if +self+ is equal to the given value.

string.c

@@ -11443,9 +11443,8 @@ rb_str_unicode_normalized_p(int argc, VALUE *argv, VALUE str)
  * === Methods for Querying
  *
  * - ::all_symbols:: Returns an array of the symbols currently in Ruby's symbol table.
- * - {#=~}[#method-i-3D~]:: Returns the index of the first substring
+ * - #=~:: Returns the index of the first substring in symbol that matches a
- *                          in symbol that matches a given Regexp
+ *         given Regexp or other object; returns +nil+ if no match is found.
- *                          or other object; returns +nil+ if no match is found.
  * - #[], #slice :: Returns a substring of symbol
  *                  determined by a given index, start/length, or range, or string.
  * - #empty?:: Returns +true+ if +self.length+ is zero; +false+ otherwise.
@@ -11729,7 +11728,7 @@ sym_cmp(VALUE sym, VALUE other)
  *  call-seq:
  *    casecmp(other_symbol) -> -1, 0, 1, or nil
  *
- *  Case-insensitive version of {Symbol#<=>}[#method-i-3C-3D-3E]:
+ *  Case-insensitive version of #<=>:
  *
  *    :aBcDeF.casecmp(:abcde)   # => 1
  *    :aBcDeF.casecmp(:abcdef)  # => 0
@@ -12274,8 +12273,8 @@ rb_enc_interned_str_cstr(const char *ptr, rb_encoding *enc)
  *
  *  _Substrings_
  *
- *  - {#=~}[#method-i-3D~]:: Returns the index of the first substring that matches a given Regexp or other object;
+ *  - #=~:: Returns the index of the first substring that matches a given
- *                           returns +nil+ if no match is found.
+ *          Regexp or other object; returns +nil+ if no match is found.
  *  - #index:: Returns the index of the _first_ occurrence of a given substring;
  *             returns +nil+ if none found.
  *  - #rindex:: Returns the index of the _last_ occurrence of a given substring;