docs: add Banning Users to index.md

Author: datamweb

docs/index.md

@@ -6,10 +6,11 @@
 * [Authentication](authentication.md)
 * [Authorization](authorization.md)
 * [Auth Actions](auth_actions.md)
-* [Forcing Password Reset](forcing_password_reset.md)
 * [Events](events.md)
 * [Testing](testing.md)
 * [Customization](customization.md)
+* [Forcing Password Reset](forcing_password_reset.md)
+* [Banning Users](banning_users.md)
 
 ## Guides
 * [Protecting an API with Access Tokens](guides/api_tokens.md)