The call-seq directive has no useful effect on our documentation and is not used anywhere else.

Worse still, its use breaks some rdoc, replacing method names with a curly brace.
Having just one call-seq directive doesn't add anything since this is covered by regular rdoc.
Having multiple might make sense, but these are already documented with examples.

This partly re-reverts 60de0e56b7 but does not
touch the vendorized code in html-scanner.

actionpack/lib/action_dispatch/testing/assertions/selector.rb

@@ -24,10 +24,6 @@ module ActionDispatch
     #
     # Also see HTML::Selector to learn how to use selectors.
     module SelectorAssertions
-      # :call-seq:
-      #   css_select(selector) => array
-      #   css_select(element, selector) => array
-      #
       # Select and return all matching elements.
       #
       # If called with a single argument, uses that argument as a selector
@@ -99,10 +95,6 @@ module ActionDispatch
         selector.select(root)
       end
 
-      # :call-seq:
-      #   assert_select(selector, equality?, message?)
-      #   assert_select(element, selector, equality?, message?)
-      #
       # An assertion that selects elements and makes one or more equality tests.
       #
       # If the first argument is an element, selects all matching elements
@@ -332,11 +324,6 @@ module ActionDispatch
         end
       end
 
-      # :call-seq:
-      #   assert_select_rjs(id?) { |elements| ... }
-      #   assert_select_rjs(statement, id?) { |elements| ... }
-      #   assert_select_rjs(:insert, position, id?) { |elements| ... }
-      #
       # Selects content from the RJS response.
       #
       # === Narrowing down
@@ -474,9 +461,6 @@ module ActionDispatch
         end
       end
 
-      # :call-seq:
-      #   assert_select_encoded(element?) { |elements| ... }
-      #
       # Extracts the content of an element, treats it as encoded HTML and runs
       # nested assertion on it.
       #
@@ -543,9 +527,6 @@ module ActionDispatch
         end
       end
 
-      # :call-seq:
-      #   assert_select_email { }
-      #
       # Extracts the body of an email and runs nested assertions on it.
       #
       # You must enable deliveries for this assertion to work, use:

activerecord/lib/active_record/persistence.rb

@@ -18,9 +18,6 @@ module ActiveRecord
       !(new_record? || destroyed?)
     end
 
-    # :call-seq:
-    #   save(options)
-    #
     # Saves the model.
     #
     # If the model is new a record gets created in the database, otherwise