git_webhook.py: rewrite comment to reflect the reality

tools/git_webhook.py

@@ -34,7 +34,7 @@ class HttpHandler(BaseHTTPRequestHandler):
             self.send_response(400)
             return
 
-        # Don't make em wait.
+        # todo: This way of doing it blocks both parties. Not ideal.
         self.send_response(200)
 
         subprocess.run(["git", "pull"])