add topic frontmatter to articles (#18245)

content/github/authenticating-to-github/sudo-mode.md

@@ -6,6 +6,9 @@ redirect_from:
 versions:
   free-pro-team: '*'
   enterprise-server: '*'
+topics:
+  - identity
+  - access management
 ---
 
 After you've performed a sudo-protected action, you'll only be asked to re-authenticate again after a few hours of inactivity. Every sudo-protected action resets this timer.