docs: fix supported platforms of powerMonitor (#25215)

Co-authored-by: Cheng Zhao <[email protected]>

docs/api/power-monitor.md

@@ -24,19 +24,19 @@ app.whenReady().then(() => {
 
 The `powerMonitor` module emits the following events:
 
-### Event: 'suspend' _Linux_ _Windows_
+### Event: 'suspend' _macOS_ _Windows_
 
 Emitted when the system is suspending.
 
-### Event: 'resume' _Linux_ _Windows_
+### Event: 'resume' _macOS_ _Windows_
 
 Emitted when system is resuming.
 
-### Event: 'on-ac' _Windows_
+### Event: 'on-ac' _macOS_ _Windows_
 
 Emitted when the system changes to AC power.
 
-### Event: 'on-battery' _Windows_
+### Event: 'on-battery' _macOS_  _Windows_
 
 Emitted when system changes to battery power.