Update stale comments

Author: MartiUK

.github/stale.yml

@@ -10,9 +10,10 @@ staleLabel: "👀 Awaiting Response"
 # Comment to post when marking an issue as stale. Set to `false` to disable
 markComment: >
   This issue has been automatically marked as stale because it has not had
-  recent activity. It will be closed in a week if no further activity occurs.
-  Thank you for your contribution.
+  any recent activity. It will be closed in a week if no further activity occurs.
+  Thank you for your contribution(s).
 # Comment to post when closing a stale issue. Set to `false` to disable
 closeComment: >
   This issue has been automatically closed due to it not having any
-  activity since it was marked as stale. Thank you for your contribution.
+  activity since it was marked as stale.
+  Thank you for your contribution(s).