more docs clarification

Author: jippi

README.md

@@ -122,7 +122,9 @@ Using scm-engine within a GitLab CI pipeline is straight forward.
 1. Add a `.scm-engine.yml` file in the root of your project.
 1. Create a [CI/CD Variable](https://docs.gitlab.com/ee/ci/variables/#for-a-group)
     1. Name must be `SCM_ENGINE_TOKEN`
-    1. Value must a [Project Access Token](https://docs.gitlab.com/ee/user/project/settings/project_access_tokens.html) with `api` scope.
+    1. Value must a [Project Access Token](https://docs.gitlab.com/ee/user/project/settings/project_access_tokens.html)
+        1. With `api` scope.
+        1. With `developer` or `maintainer` role access so it can edit Merge Requests.
     1. `Mask` **should** be checked.
     1. `Protected` **should NOT** be checked.
     1. `Expand variable reference` **should NOT** be checked.