Merge branch 'jfarmiloe-doc-v17-changes' into 'master'

Add v17 changes page with new runner registration workflow details

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/148278



Merged-by: Achilleas Pipinellis <axil@gitlab.com>
Approved-by: Achilleas Pipinellis <axil@gitlab.com>
Co-authored-by: Justin Farmiloe <jfarmiloe@gitlab.com>