Backport (2-0-x) - docs: Document missing quit events during shutdown (…

…#13026)

* docs: Document missing events during shutdown

* docs: Better language

docs/api/app.md

@@ -64,6 +64,9 @@ terminating the application.
 then `before-quit` is emitted *after* emitting `close` event on all windows and
 closing them.
 
+**Note:** On Windows, this event will not be emitted if the app is closed due
+to a shutdown/restart of the system or a user logout.
+
 ### Event: 'will-quit'
 
 Returns:
@@ -77,6 +80,9 @@ terminating the application.
 See the description of the `window-all-closed` event for the differences between
 the `will-quit` and `window-all-closed` events.
 
+**Note:** On Windows, this event will not be emitted if the app is closed due
+to a shutdown/restart of the system or a user logout.
+
 ### Event: 'quit'
 
 Returns:
@@ -86,6 +92,9 @@ Returns:
 
 Emitted when the application is quitting.
 
+**Note:** On Windows, this event will not be emitted if the app is closed due
+to a shutdown/restart of the system or a user logout.
+
 ### Event: 'open-file' _macOS_
 
 Returns: