Merge branch 'mw-update-bitbucket-server-docs' into 'master'

BitBucket Server: Add note about reviewers not being imported

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/130025



Merged-by: Evan Read <eread@gitlab.com>
Approved-by: Evan Read <eread@gitlab.com>
Co-authored-by: Martin Wortschack <mwortschack@gitlab.com>