Update docs to refer to new token endpoint (#64)

* fix: update docs to refer to new token endpoint

* fix: add endpoint response format as well

Author: 1egoman

TEMPLATE.md

@@ -8,14 +8,24 @@ This template implements a minimal token server using Node.js, TypeScript, Expre
 
 When running this token server as a sandbox app, LiveKit hosts a public endpoint you can use to generate tokens. To generate a token, simply make a `POST` request to `https://cloud-api.livekit.io/api/sandbox/connection-details` with the following request format:
 
-| **Request format** |                              |                                |
-| ------------------ | ---------------------------- | ------------------------------ |
-| Method             | `POST`                       |                                |
-| URL                | `https://cloud-api.livekit.io/api/sandbox/connection-details` |
-| Optional Parameters| `roomName`                   | (your room name)               |
-|                    | `participantName`            | (your participant name)        |
-| Headers            | `X-Sandbox-ID`               | (your Sandbox ID)              |
-|                    | `Content-Type`               | `application/json`             |
+| **Request format** |                              |                                   |
+| ------------------ | ---------------------------- | --------------------------------- |
+| Method             | `POST`                       |                                   |
+| URL                | `https://cloud-api.livekit.io/api/v2/sandbox/connection-details` |
+| Headers            | `X-Sandbox-ID`               | (your Sandbox ID)                 |
+|                    | `Content-Type`               | `application/json`                |
+| Optional Body      | `room_name`                  | (optional room name)              |
+|                    | `participant_identity`       | (optional participant identity)   |
+|                    | `participant_name`           | (optional participant name)       |
+|                    | `participant_metadata`       | (optional participant metadata)   |
+|                    | `participant_attributes`     | (optional participant attributes) |
+|                    | `room_config`                | (optional room config)            |
+
+| **Response format** |                              |                                  |
+| ------------------- | ---------------------------- | -------------------------------- |
+| Response Body       | `server_url`                 | Room connection url              |
+|                     | `participant_token`          | Room connection token            |
+
 
 Generated tokens will have a default TTL of 15 minutes. Optional parameters not included in the request will be generated by the token server.