Merge branch 'eread/remove-trailing-whitespace-from-some-documentation-files' into 'master'

Remove trailing whitespace from some documentation files

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/155161



Merged-by: Russell Dickenson <rdickenson@gitlab.com>
Approved-by: Russell Dickenson <rdickenson@gitlab.com>
Co-authored-by: Evan Read <eread@gitlab.com>