[ruby/irb] Update descriptions of methods

From Reidline to Reline

Update description used in take_corresponding_syntax_to_kw_do and is_the_in_correspond_to_a_for methods

Use possessive noun correctly

Second element

https://github.com/ruby/irb/commit/4fa9714d6f

lib/irb.rb

@@ -867,7 +867,7 @@ module IRB
 
       # If the expression is invalid, Ripper.sexp should return nil which will
       # result in false being returned. Any valid expression should return an
-      # s-expression where the second selement of the top level array is an
+      # s-expression where the second element of the top level array is an
       # array of parsed expressions. The first element of each expression is the
       # expression's type.
       verbose, $VERBOSE = $VERBOSE, nil

lib/irb/input-method.rb

@@ -265,7 +265,8 @@ module IRB
 
   class ReidlineInputMethod < InputMethod
     include Reline
-    # Creates a new input method object using Readline
+
+    # Creates a new input method object using Reline
     def initialize
       IRB.__send__(:set_encoding, Reline.encoding_system_needs.name, override: false)
       super

lib/irb/ruby-lex.rb

@@ -477,7 +477,7 @@ class RubyLex
 
   def take_corresponding_syntax_to_kw_do(tokens, index)
     syntax_of_do = nil
-    # Finding a syntax correnponding to "do".
+    # Finding a syntax corresponding to "do".
     index.downto(0) do |i|
       tk = tokens[i]
       # In "continue", the token isn't the corresponding syntax to "do".
@@ -508,7 +508,7 @@ class RubyLex
 
   def is_the_in_correspond_to_a_for(tokens, index)
     syntax_of_in = nil
-    # Finding a syntax correnponding to "do".
+    # Finding a syntax corresponding to "do".
     index.downto(0) do |i|
       tk = tokens[i]
       # In "continue", the token isn't the corresponding syntax to "do".