Merge branch 'master-patch-8673' into 'master'

Clarify Guest+1 seat count

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/131528



Merged-by: Jon Glassman <jglassman@gitlab.com>
Approved-by: Hannah Sutor <hsutor@gitlab.com>
Approved-by: Aathira Nair <anair@gitlab.com>
Reviewed-by: Chloe Cartron <ccartron@gitlab.com>
Co-authored-by: Chloe Cartron <ccartron@gitlab.com>
Co-authored-by: Hannah Sutor <hsutor@gitlab.com>