Merge branch 'clarify-documentation-regarding-end-date' into 'master'

Add examples to subscription expiry documentation

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/154771



Merged-by: Jon Glassman <jglassman@gitlab.com>
Approved-by: Jon Glassman <jglassman@gitlab.com>
Co-authored-by: Tarun Vellishetty <tvellishetty@gitlab.com>