Correct code comment in PBE to reflect current behavior (#83269)

Correct a code comment in the PlaybookExecutor class that explains
the host failure condition under which the PBE breaks out of the
run. This comment previously stated that the maximum failure
percentage was checked, but that logic has been refactored into
the linear strategy plugin.

lib/ansible/executor/playbook_executor.py

@@ -195,10 +195,7 @@ class PlaybookExecutor:
                                 result = self._tqm.RUN_FAILED_HOSTS
                                 break_play = True
 
-                            # check the number of failures here, to see if they're above the maximum
+                            # check the number of failures here and break out if the entire batch failed
-                            # failure percentage allowed, or if any errors are fatal. If either of those
-                            # conditions are met, we break out, otherwise we only break out if the entire
-                            # batch failed
                             failed_hosts_count = len(self._tqm._failed_hosts) + len(self._tqm._unreachable_hosts) - \
                                 (previously_failed + previously_unreachable)