Update service.md

Update known `appProtocols` to match the KEP

https://github.com/kubernetes/enhancements/blob/master/keps/sig-network/3726-standard-application-protocols/README.md?plain=1#L179

Author: dprotaso

content/en/docs/concepts/services-networking/service.md

@@ -368,6 +368,8 @@ This field follows standard Kubernetes label syntax. Valid values are one of:
 | Protocol | Description |
 |----------|-------------|
 | `kubernetes.io/h2c` | HTTP/2 over cleartext as described in [RFC 7540](https://www.rfc-editor.org/rfc/rfc7540) |
+| `kubernetes.io/ws`  | WebSocket over cleartext as described in [RFC 6455](https://www.rfc-editor.org/rfc/rfc6455) |
+| `kubernetes.io/wss` | WebSocket over TLS as described in [RFC 6455](https://www.rfc-editor.org/rfc/rfc6455) |
 
 ### Multi-port Services