Merge branch 'asalii-master-patch-47426' into 'master'

Update docs in /gitlab/doc/api to replace "master" with "main"

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/131989



Merged-by: Amy Qualls <aqualls@gitlab.com>
Approved-by: Amy Qualls <aqualls@gitlab.com>
Co-authored-by: Artur Salii <asalii@gitlab.com>