Merge branch 'readme-fix-overflow-anchor' into 'master'

Readme: Fix anchor overflow behavior when collapsed (Firefox)

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/144571



Merged-by: Brandon Labuschagne <blabuschagne@gitlab.com>
Approved-by: Brandon Labuschagne <blabuschagne@gitlab.com>
Approved-by: Julia Miocene <jmiocene@gitlab.com>
Approved-by: Andrei Zubov <azubov@gitlab.com>
Reviewed-by: Andrei Zubov <azubov@gitlab.com>
Co-authored-by: Sascha Eggenberger <seggenberger@gitlab.com>