Add a comment to ensure that a test won't be removed [ci skip]

The 'cow' => 'kine' inflection has gone with c300dca9 but it should
not be removed from the tested irregularities since it ensures that
inflections work with words that do not begin with the same letters.
Add spaces to deep_munge log message.
Merge pull request #14258 from shuhei/fix_deep_munge_log

Add spaces to the log message of ActionController:: LogSubscriber#deep_munge