docs: fix simple typo, ougoging -> outgoing (#1120)

There is a small typo in starlette/middleware/gzip.py.

Should read `outgoing` rather than `ougoging`.

Co-authored-by: Jamie Hewland <jhewland@gmail.com>

starlette/middleware/gzip.py

@@ -38,7 +38,7 @@ async def send_with_gzip(self, message: Message) -> None:
         message_type = message["type"]
         if message_type == "http.response.start":
             # Don't send the initial message until we've determined how to
-            # modify the ougoging headers correctly.
+            # modify the outgoing headers correctly.
             self.initial_message = message
         elif message_type == "http.response.body" and not self.started:
             self.started = True