Mention context param for generateJWT

src/app/connect/auth/frameworks/next/page.mdx

@@ -271,6 +271,17 @@ export async function logout() {
 }
 ```
 
+You can include custom context in the JWT token with the `context` parameter:
+
+```ts
+const jwt = await thirdwebAuth.generateJWT({
+	payload: verifiedPayload.payload,
+	context: {
+		admin: true,
+	},
+});
+```
+
 Now anywhere in your project, you can check a user's authentication status:
 
 ```tsx