fix comment typo

Author: arjan-bal

internal/transport/http2_server.go

@@ -1353,7 +1353,7 @@ func (t *http2Server) closeStream(s *ServerStream, rst bool, rstCode http2.ErrCo
 	// called to interrupt the potential blocking on other goroutines.
 	s.cancel()
 
-	// We can't return early even if the stream's state is "done," as the state
+	// We can't return early even if the stream's state is "done" as the state
 	// might have been set by the `finishStream` method. Deleting the stream via
 	// `finishStream` can get blocked on flow control.
 	s.swapState(streamDone)