Merge branch 'issue-doc-479161' into 'master'

Update alt texts in terms.md

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/183868



Merged-by: Emily Sahlani <esahlani@gitlab.com>
Approved-by: Emily Sahlani <esahlani@gitlab.com>
Co-authored-by: Samyak Jain <samyakjain137@gmail.com>

doc/administration/settings/terms.md

@@ -41,7 +41,7 @@ If an authenticated user declines the terms, they are signed out.
 
 When enabled, it adds a mandatory checkbox to the sign up page for new users:
 
-![Sign up form](img/sign_up_terms_v11_0.png)
+![Sign-up form with a mandatory terms acceptance checkbox](img/sign_up_terms_v11_0.png)
 
 <!-- ## Troubleshooting