fix(nextjs-push-guide): update channel CLI example and add push CLI link to next steps

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: maratal

src/pages/docs/push/getting-started/nextjs.mdx

@@ -469,9 +469,9 @@ To test channel push, subscribe to the channel in the UI then send a push notifi
 <Code>
 ```shell
 ably push publish --channel exampleChannel1 \
-  --title "Ably CLI" \
-  --body "Hello from CLI!" \
-  --data '{"foo":"bar"}'
+  --title "Hello" \
+  --body "World!" \
+  --message '{"name":"greeting","data":"Hello World!"}'
 ```
 </Code>
 
@@ -521,5 +521,6 @@ Safari on macOS 13+ supports Web Push, but with some limitations. Notification a
 * Learn about [channel rules](/docs/channels#rules) for channel-based push notifications.
 * Read more about the [Push Admin API](/docs/api/realtime-sdk/push-admin).
 * Check out the [Web Push Notifications](/docs/push/configure/web) documentation for advanced use cases.
+* Explore [Ably CLI push commands](/docs/cli/push) for the full list of push CLI options.
 
 You can also explore the [Ably JavaScript SDK](https://github.com/ably/ably-js) on GitHub, or visit the [API references](/docs/api/realtime-sdk?lang=javascript) for additional functionality.