Merge pull request #36320 from XrXr/no-doc-prepend

[CI skip] Put :nodoc: on method that raises NoMethodError

activerecord/lib/active_record/associations/collection_proxy.rb

@@ -1029,7 +1029,7 @@ def <<(*records)
       alias_method :append, :<<
       alias_method :concat, :<<
 
-      def prepend(*args)
+      def prepend(*args) # :nodoc:
         raise NoMethodError, "prepend on association is not defined. Please use <<, push or append"
       end