Update cluster_environment.py

Author: ananthsub

pytorch_lightning/plugins/environments/cluster_environment.py

@@ -43,5 +43,5 @@ def node_rank(self) -> int:
         """ The rank (index) of the node on which the current process runs. """
 
     def teardown(self) -> None:
-        """ Clean up any environment variables after execution finishes. """
+        """ Clean up any state set after execution finishes. """
         pass