Fix wrong comment

Author: rbagd

instrumentation/opentelemetry-instrumentation-celery/src/opentelemetry/instrumentation/celery/__init__.py

@@ -198,7 +198,7 @@ def _uninstrument(self, **kwargs):
 
     def _trace_received(self, *args, **kwargs):
         """
-        On prerun signal, task is prefetched and prefetch timer starts
+        On receive signal, task is prefetched and prefetch timer starts
         """
 
         request = utils.retrieve_request(kwargs)