Merge branch 'DarrenEastman-master-patch-8cb5' into 'master'

Add link to Git Submodules docs in the Configuring Runners docs

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/167846



Merged-by: Roshni Sarangadharan <rsarangadharan@gitlab.com>
Co-authored-by: Darren Eastman <deastman@gitlab.com>