Merge branch 'Docs-ServiceNow-Vale' into 'master'

Docs: Changed "OAuth2" to "OAuth 2.0" in ServiceNow

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/183942



Merged-by: Ashraf Khamis <akhamis@gitlab.com>
Approved-by: Ashraf Khamis <akhamis@gitlab.com>
Co-authored-by: Ryan <crs8voedg@mozmail.com>