docs: updated io.createToken docs to include the platform context (#591)

apps/web/src/inputs/docs/@pluv_io/API Reference.mdx

@@ -79,6 +79,12 @@ Creates a JWT for a user trying to connect to a room. This should be called with
 
 ```ts
 const token = await io.createToken({
+    // If using @platform/node
+    req: req as IncomingMessage,
+    // If using @platform/cloudflare
+    // This is the env from the Cloudflare worker handler's fetch function
+    env: env as Env,
+    // ...
     room: "my-example-room",
     user: {
         id: "abc123",
@@ -167,4 +173,5 @@ Registers a websocket to the room. Accepts a secondary options parameter to pass
 room.register(webSocket, { token })
 ```
 
-export default ({ children }) => <DocsLayout meta={meta}>{children}</DocsLayout>;
+export default ({ children }) => <DocsLayout meta={meta}>{children}</DocsLayout>;import { IncomingMessage } from "http";
+