websockets / ws / 2473 / 2

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Pull #1834

travis-ci-com

Fixed code issue in docs for broadcasting 

in the example 

```js
const WebSocket = require('ws');

const wss = new WebSocket.Server({ port: 8080 });

wss.on('connection', function connection(ws) {
  ws.on('message', function incoming(data) {
    wss.clients.forEach(function each(client) {
      if (client !== ws && client.readyState === WebSocket.OPEN) {
        client.send(data);
      }
    });
  });
});
```

`ws` is not defined and throws an error. It should be `wss`. Just had this error myself and contribute to fix the docs.

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