doc/schemas: add websocket to type in doc/schemas/notification/connect.json

This is done by tests/test_connection.py::test_websocket:

```
{
  "jsonrpc": "2.0",
  "method": "connect",
  "params": {
    "connect": {
      "id": "031b84c5567b126440995d3ed5aaba0565d71e1834604819ff9c17f5e9d5dd078f",
      "direction": "in",
      "address": {
        "type": "websocket",
        "subtype": "ipv4",
        "address": "127.0.0.1",
        "port": 59412
      }
    }
  }
}
```

Totally breaks all the GRPC code though.

Signed-off-by: Rusty Russell <[email protected]>

Author: rustyrussell

doc/schemas/notification/connect.json

@@ -53,7 +53,8 @@
               "ipv4",
               "ipv6",
               "torv2",
-              "torv3"
+              "torv3",
+              "websocket"
             ],
             "description": [
               "Type of connection (*torv2*/*torv3* only if **direction** is *out*)"