Merge branch 'jdiaz-clarify-bitbucket-oauth-docs' into 'master'

Clarify the Bitbucket Cloud OAuth integration documentation for multi-node architectures

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/175884



Merged-by: Suzanne Selhorn <sselhorn@gitlab.com>
Co-authored-by: John Diaz <jdiaz@gitlab.com>