Specify end event is only about server side stream

Author: mstoykov

src/data/markdown/docs/02 javascript api/07 k6-experimental/02 grpc/30 Stream/10-Stream-on.md

@@ -16,7 +16,7 @@ Possible events:
 | --------- | -------- |
 | data       | Emitted when the server sends data|
 | error    | Emitted when an error occurs. In case of the error, an [`Error`](/javascript-api/k6-experimental/grpc/stream/error/) object sends to the handler function.|
-| end      | Emitted when stream closes |
+| end      | Emitted when the server closes the incoming stream.  |
 
 
 ### Example