obs-repository-copy: clarify the message

To clarify that the user doesn't have to run commands himself on OBS.

Signed-off-by: Dylan Aïssi <dylan.aissi@collabora.com>

.gitlab-ci/branching.yml

@@ -213,7 +213,7 @@ obs-repository-copy:
 
     - |
       cat <<EOF
-      👷 Commands to be run on OBS Backend Server:
+      👷 OBS is copying new repositories from the old ones.
 
       * The backend copy operation is a scheduled job with no reporting progress
       * Ascertain the status of the copy operation by verifying the scheduler logs