Merge branch 'FixUnreleasedChangelog' into 'master'

Fix unreleased changelog "-30974-issue-search-by-number.yml"

See merge request gitlab-org/gitlab-ce!30979

changelogs/unreleased/-30974-issue-search-by-number.yml → changelogs/unreleased/30974-issue-search-by-number.yml

 ---
 title: "Search issuables by iids"
-merge_request: !28302
+merge_request: 28302
 author: Riccardo Padovani
 type: fixed