Merge branch 'eduardosanz/improve-wording-saml' into 'master'

Improve SAML SSO wording

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/99252



Merged-by: Simon Knox <simon@gitlab.com>
Approved-by: Artur Fedorov <afedorov@gitlab.com>
Approved-by: Simon Knox <simon@gitlab.com>
Approved-by: Amy Qualls <aqualls@gitlab.com>
Co-authored-by: Amy Qualls <aqualls@gitlab.com>
Co-authored-by: Eduardo Sanz García <esanz-garcia@gitlab.com>