comment update

Author: wtripp180901

.github/workflows/stackhpc-multinode.yml

@@ -43,7 +43,7 @@ name: Multinode
           - never
           - success
       break_duration:
-        description: How long to break execution for (minutes)
+        description: How long to break execution for (minutes) (note that instances are cleaned up after 12h)
         type: number
         default: 60
       ssh_key: