Merge branch 'hustewart-gitlab-shell-docs-install' into 'master'

Remove extraneous period

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/183894



Merged-by: Brendan Lynch <blynch@gitlab.com>
Approved-by: Brendan Lynch <blynch@gitlab.com>
Co-authored-by: hustewart <hustewart@gitlab.com>