add detail to description for --all flag

Signed-off-by: Collins Abitekaniza <[email protected]>

compose/cli/main.py

@@ -694,7 +694,7 @@ class TopLevelCommand(object):
             -q, --quiet          Only display IDs
             --services           Display services
             --filter KEY=VAL     Filter services by a property
-            -a, --all            Show all stopped containers
+            -a, --all            Show all stopped containers (including those created by the run command)
         """
         if options['--quiet'] and options['--services']:
             raise UserError('--quiet and --services cannot be combined')