Clarified max_attempts behavior (docker#5949)

Author: stshow

compose/compose-file/index.md

@@ -726,7 +726,10 @@ Configures if and how to restart containers when they exit. Replaces
 - `delay`: How long to wait between restart attempts, specified as a
   [duration](#specifying-durations) (default: 0).
 - `max_attempts`: How many times to attempt to restart a container before giving
-  up (default: never give up).
+  up (default: never give up). If the restart does not succeed within the configured 
+  `window`, this attempt doesn't count toward the configured `max_attempts` value. 
+  For example, if `max_attempts` is set to '2', and the restart fails on the first
+  attempt, more than two restarts may be attempted.
 - `window`: How long to wait before deciding if a restart has succeeded,
   specified as a [duration](#specifying-durations) (default:
   decide immediately).