Clarify why cli method does nothing

Author: AlePouroullis

src/humanloop/cli/__main__.py

@@ -108,7 +108,7 @@ def wrapper(*args, **kwargs):
         "max_content_width": 100,
     }
 )
-def cli():
+def cli(): # Does nothing because used as a group for other subcommands (pull, push, etc.)
     """Humanloop CLI for managing sync operations."""
     pass