This is a cosmetic modification for a specific Feed.
If you retitle a Diff (and you do nothing else), its Feed
is somehow too much verbose:
... retitled NEW_TITLE from OLD_TITLE to NEW_TITLE
In this specific case, the Feed now becomes shorter so that
the NEW_TITLE is not repeated twice:
... retitled NEW_TITLE from OLD_TITLE
Note that, if the title changes again, the Feed naturally comes
back as before so to mention the change and obviously without
any repetition. Example:
... retitled CURRENT_TITLE from OLD_TITLE to NEW_TITLE
Closes T15183