docs: improve oauth generic azure ad instructions

docs/sources/auth/generic-oauth.md

@@ -174,7 +174,7 @@ allowed_organizations =
     allowed_organizations =
     ```
 
-Note: It's important to ensure that the SERVER_ROOT_URL in Grafana is set in your Azure Application Return URLs
+> Note: It's important to ensure that the [root_url](/installation/configuration/#root-url) in Grafana is set in your Azure Application Reply URLs (App -> Settings -> Reply URLs)
 
 ## Set up OAuth2 with Centrify