docs(ins): update standby mode documentation

Author: bene2k1

pages/instances/how-to/use-standby-mode.mdx

@@ -7,7 +7,7 @@ content:
   paragraph: Learn how to use standby mode on Scaleway Instances to save resources and reduce costs without losing data or configurations.
 tags: instance standby standby-mode
 dates:
-  validation: 2025-03-03
+  validation: 2025-05-21
   posted: 2021-05-26
 categories:
   - compute
@@ -32,6 +32,10 @@ categories:
 
     Your Instance is now in standby mode.
 
+<Message type="tip">
+  Alternatively, you can put your Instance into standby mode from the terminal by typing the `poweroff` command. This will shut down your Instance and switch it to standby mode.
+</Message>
+
 <Message type="important">
   You are still billed for an Instance in standby mode, as well as for its storage and any flexible IPs attached to it. To avoid being charged for an unused Instance, you can [power it off](/instances/how-to/power-off-instance/). <br /><br />
   [Find out when the billing of your Instance starts and stops](/billing/faq/#when-does-the-billing-of-an-instance-start-and-stop).