Merge branch 'docs-missing-backticks' into 'master'

Docs: Add missing backtick fence to code block

See merge request gitlab-org/gitlab-ce!30494

doc/api/users.md

@@ -164,6 +164,7 @@ the `group_saml` provider option:
     ...
   }
 ]
+```
 
 You can lookup users by external UID and provider: