[ci skip] Add missing `super` to the setup of the...

[ci skip] Add missing `super` to the setup of the `ActiveSupport::LogSubscriber::TestHelper` example.

activesupport/lib/active_support/log_subscriber/test_helper.rb

@@ -11,6 +11,7 @@ class LogSubscriber
     #     include ActiveSupport::LogSubscriber::TestHelper
     #
     #     def setup
+    #       super
     #       ActiveRecord::LogSubscriber.attach_to(:active_record)
     #     end
     #