Fix callback url

doc/integration/github.md

@@ -21,10 +21,10 @@ To get the credentials (a pair of Client ID and Client Secret), you must registe
     - Application name: This can be anything. Consider something like `<Organization>'s GitLab` or `<Your Name>'s GitLab` or something else descriptive.
     - Homepage URL: the URL to your GitLab installation. e.g., `https://gitlab.company.com`
     - Application description: Fill this in if you wish.
-    - Authorization callback URL: `http(s)://${YOUR_DOMAIN}/users/auth`. Please make sure the port is included if your GitLab instance is not configured on default port.
+    - Authorization callback URL: `http(s)://${YOUR_DOMAIN}/users/auth/github/callback`. Please make sure the port is included if your GitLab instance is not configured on default port.
     ![Register OAuth App](img/github_register_app.png)
 
-    NOTE: Be sure to append `/users/auth` to the end of the callback URL
+    NOTE: Be sure to append `/users/auth/github/callback` to the end of the callback URL
     to prevent a [OAuth2 convert
     redirect](http://tetraph.com/covert_redirect/) vulnerability.