fix: update channel push CLI commands to use push publish --channel flag

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

@@ -554,12 +554,14 @@ You can get your device ID from the device details button (don't confuse it with
 
 ### Send push via channel <a id="step-4-send-channel"/>
 
-To test pushes via channel, subscribe to "Channel 1" in the UI and post a message to the "exampleChannel1"
-with a `push` `extras` field using Ably CLI:
+To test pushes via channel, subscribe to "Channel 1" in the UI and send a push notification to the channel using the Ably CLI:
 
 <Code>
 ```shell
-ably channels publish exampleChannel1 '{"name":"example","data":"Hello from CLI!","extras":{"push":{"notification":{"title":"Ably CLI","body":"Hello from CLI!"},"data":{"foo":"bar"}}}}'
+ably push publish --channel exampleChannel1 \
+  --title "Hello" \
+  --body "World!" \
+  --message '{"name":"greeting","data":"Hello World!"}'
 ```
 </Code>
 
@@ -989,5 +991,6 @@ Verify that your app receives and handles location push notifications correctly
 * Learn about [rules](/docs/push/channel-rules) for channel-based push notifications.
 * Read more about the [Push Admin API](/docs/api/realtime-sdk?lang=swift#push-admin).
 * Check out the [Push Notifications](/docs/push) 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 SDK for Swift](https://github.com/ably/ably-cocoa) on GitHub, or visit the [API references](/docs/api/realtime-sdk?lang=swift) for additional functionality.

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

@@ -659,11 +659,14 @@ Build and run your app on an Android device or emulator. Tap **Activate Push** a
 
 ### Send push via channel <a id="step-4-send-channel"/>
 
-To test push notifications via channel, tap **Subscribe to Channel** in the app and then publish a message to "exampleChannel1" with a `push` `extras` field using Ably CLI:
+To test push notifications via channel, tap **Subscribe to Channel** in the app and then send a push notification to the channel using the Ably CLI:
 
 <Code>
 ```shell
-ably channels publish exampleChannel1 '{"name":"example","data":"Hello from CLI!","extras":{"push":{"notification":{"title":"Ably CLI","body":"Hello from CLI!"},"data":{"foo":"bar"}}}}'
+ably push publish --channel exampleChannel1 \
+  --title "Hello" \
+  --body "World!" \
+  --message '{"name":"greeting","data":"Hello World!"}'
 ```
 </Code>
 
@@ -823,5 +826,6 @@ Build and run your app again. Use the new buttons to send push notifications dir
 * Explore [push notification administration](/docs/push#push-admin) for managing devices and subscriptions.
 * Learn about [rules](/docs/channels#rules) for channel-based push notifications.
 * Read more about the [Push Admin API](/docs/api/realtime-sdk/push-admin).
+* Explore [Ably CLI push commands](/docs/cli/push) for the full list of push CLI options.
 
 You can also explore the [Ably SDK for Android](https://github.com/ably/ably-java) on GitHub, or visit the [API references](/docs/api/realtime-sdk?lang=kotlin) for additional functionality.

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

@@ -570,11 +570,14 @@ Try sending push using this `deviceId` or `clientId` as shown earlier.
 
 ### Send push via channel <a id="step-4-send-channel"/>
 
-To test pushes via channel, subscribe to the channel in the UI and post a message to the "exampleChannel1" with a `push` `extras` field using Ably CLI:
+To test pushes via channel, subscribe to the channel in the UI and send a push notification to the channel using the Ably CLI:
 
 <Code>
 ```shell
-ably channels publish exampleChannel1 '{"name":"example","data":"Hello from CLI!","extras":{"push":{"notification":{"title":"Ably CLI","body":"Hello from CLI!"},"data":{"foo":"bar"}}}}'
+ably push publish --channel exampleChannel1 \
+  --title "Hello" \
+  --body "World!" \
+  --message '{"name":"greeting","data":"Hello World!"}'
 ```
 </Code>
 
@@ -727,5 +730,6 @@ Safari on macOS 13+ supports Web Push, but with some limitations. Notification a
 * Learn about [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.