Update Gitlab.md

doc/integrations/Single-Sign-On/Gitlab.md

@@ -12,10 +12,12 @@ The following steps can be used to configure Mattermost to use GitLab as a singl
 3. Submit the application and copy the given _Id_ and _Secret_ into the appropriate _SSOSettings_ fields in config/config.json
 
 4. Also in config/config.json, set _Allow_ to `true` for the _gitlab_ section, leave _Scope_ blank and use the following for the endpoints:
-  * _AuthEndpoint_: `<your-gitlab-url>/oauth/authorize` (example http://localhost:3000/oauth/authorize)
+  * _AuthEndpoint_: `https://<your-gitlab-url>/oauth/authorize` (example https://example.com/oauth/authorize)  
-  * _TokenEndpoint_: `<your-gitlab-url>/oauth/token` 
+  * _TokenEndpoint_: `https://<your-gitlab-url>/oauth/token`  
-  * _UserApiEndpoint_: `<your-gitlab-url>/api/v3/user`
+  * _UserApiEndpoint_: `https://<your-gitlab-url>/api/v3/user`  
   
-6. (Optional) If you would like to force all users to sign-up with GitLab only, in the _ServiceSettings_ section of config/config.json please set _DisableEmailSignUp_ to `true`.
+  Note: Make sure your `HTTPS` or `HTTP` prefix for endpoint URLs matches how your server configuration. 
 
-7. Restart your Mattermost server to see the changes take effect.
+5. (Optional) If you would like to force all users to sign-up with GitLab only, in the _ServiceSettings_ section of config/config.json please set _DisableEmailSignUp_ to `true`.
+
+6. Restart your Mattermost server to see the changes take effect.