docs(aps): add warning for software update

Author: bene2k1

pages/apple-silicon/how-to/update-os-mac-mini.mdx

@@ -32,6 +32,7 @@ The recommended method to update the macOS is to reinstall your Mac mini with an
     <Message type="important">
       - When reinstalling your Mac mini, all the data on the disk is deleted, and all configurations are reset to the default values.
       - **Do not forget to backup your data before reinstalling the operating system to avoid any data loss.**
+      - Your Mac mini **will be unavailable** during the reinstallation and become available again once the reinstallation has been completed.
     </Message>
 
 ## Manually upgrading macOS
@@ -53,7 +54,9 @@ The recommended method to update the macOS is to reinstall your Mac mini with an
       3. Go back to **System settings > General > Software** update and click the Info button next to **Beta updates** to enable beta versions updates.
     </Message>
 
-### Upgrading the OS using SSH
+    <Message type="important">
+      Your Mac mini may restart during the upgrade process and be unavailable while the software update is installed. Once the update is successfully completed, it will become available again.### Upgrading the OS using SSH
+    </Message>
 
 To manually update the operating system using the `softwareupdate` tool, follow these steps:
 
@@ -72,6 +75,10 @@ To manually update the operating system using the `softwareupdate` tool, follow
         ```
     </Message>
 
+    <Message type="important">
+      Your Mac mini may restart during the upgrade process and be unavailable while the software update is installed. Once the update is successfully completed, it will become available again.### Upgrading the OS using SSH
+    </Message>
+
 <Message type="note">
   Mac Mini and macOS are trademarks of Apple Inc., registered in the U.S. and other countries and regions. iOS is a trademark or registered trademark of Cisco in the U.S. and other countries and is used by Apple under license. Scaleway is not affiliated with Apple Inc.
 </Message>