Cleanup comment (#8132)

Code relating to comment has been removed from master branch (still
present on 3.x).

Author: Dreamsorcerer

aiohttp/web_response.py

@@ -183,7 +183,6 @@ def enable_chunked_encoding(self) -> None:
 
     def enable_compression(self, force: Optional[ContentCoding] = None) -> None:
         """Enables response compression encoding."""
-        # Backwards compatibility for when force was a bool <0.17.
         self._compression = True
         self._compression_force = force