[docs] Add configuration TLS to WebSocket service document (#9145)
[docs] Add configuration TLS to WebSocket service document (#9145)

Fixes #8610

### Modifications

- Add how to enable TLS for websocket
- Add how to configure your client to connect to a tls-secured websocket endpoint

@Jennifer88huang could you take a look?
yahoo/pulsar,massakam/pulsar,massakam/pulsar,merlimat/pulsar,merlimat/pulsar,yahoo/pulsar,yahoo/pulsar,merlimat/pulsar,merlimat/pulsar,massakam/pulsar,massakam/pulsar,massakam/pulsar,yahoo/pulsar,merlimat/pulsar,massakam/pulsar,yahoo/pulsar,yahoo/pulsar,merlimat/pulsar