Update pipes.md

fix a typo, web sockets instead of microservice

Author: okbakhenissi

content/websockets/pipes.md

@@ -1,6 +1,6 @@
 ### Pipes
 
-There is no fundamental difference between [regular pipes](/pipes) and microservice pipes. The only difference is that instead of throwing `HttpException`, you should use `WsException`. In addition, all pipes will be only applied to the `data` parameter (because validating or transforming `client` instance is useless).
+There is no fundamental difference between [regular pipes](/pipes) and web sockets pipes. The only difference is that instead of throwing `HttpException`, you should use `WsException`. In addition, all pipes will be only applied to the `data` parameter (because validating or transforming `client` instance is useless).
 
 > info **Hint** The `WsException` class is exposed from `@nestjs/websockets` package.