Merge pull request #20950 from vngrs/fix_wrong_doc_about_transaction

fix doc about ActiveRecord::Transactions::ClassMethods#transaction [ci skip]

activerecord/lib/active_record/transactions.rb

@@ -204,9 +204,8 @@ module Transactions
     #
     # Note that "TRUNCATE" is also a MySQL DDL statement!
     module ClassMethods
-      # See ActiveRecord::Transactions::ClassMethods for detailed documentation.
+      # See the ConnectionAdapters::DatabaseStatements#transaction API docs.
       def transaction(options = {}, &block)
-        # See the ConnectionAdapters::DatabaseStatements#transaction API docs.
         connection.transaction(options, &block)
       end