Fix invalid changelog entries

changelogs/unreleased/13711-allow-same-period-housekeeping.yml

@@ -2,5 +2,5 @@
 title: Allow to use same periods for different housekeeping tasks (effectively
   skipping the lesser task)
 merge_request: 13711
-author: @cernvcs
+author: cernvcs
 type: added

changelogs/unreleased/36953-add-gitLab-pages-version-to-admin-dashboard.yml

 ---
 title: Add GitLab-Pages version to Admin Dashboard
 merge_request: 14040
-author: @travismiller
+author: travismiller
 type: added