Document changes in tpo/web/team#37

Some roles now have extra merge permissions on the blog and main website.

howto/lektor.md

@@ -63,6 +63,9 @@ the branch, it will publish the build artifacts and display a **View app**
 button. Clicking the button will navigate to the build result hosted on
 `review.torproject.net`.
 
+Project members with the *Developper* role on the TPO blog and main website
+have the permission to accept Merge Requests.
+
 Once the branch is deleted, after the Merge Request is accepted, for example,
 the build artifacts are automatically unpublished.