Followup to pinned Issues (#24945)

This addressees some things from #24406 that came up after the PR was
merged. Mostly from @delvh.

---------

Co-authored-by: silverwind <me@silverwind.io>
Co-authored-by: delvh <dev.lh@web.de>

custom/conf/app.example.ini

@@ -1044,7 +1044,7 @@ LEVEL = Info
 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 ;; List of reasons why a Pull Request or Issue can be locked
 ;LOCK_REASONS = Too heated,Off-topic,Resolved,Spam
-;; Maximum number of pinned Issues
+;; Maximum number of pinned Issues per repo
 ;; Set to 0 to disable pinning Issues
 ;MAX_PINNED = 3