Mention how to turn the screen on in README
Now that Ctrl+Shift+o has been reactivated, mention it in the "turn
screen off" section.
@@ -439,7 +439,7 @@ scrcpy -S
Or by pressing `Ctrl`+`o` at any time.
-To turn it back on, press `POWER` (or `Ctrl`+`p`).
+To turn it back on, press `Ctrl`+`Shift`+`o` (or `POWER`, `Ctrl`+`p`).
It can be useful to also prevent the device to sleep:
