Clarify --no-display usage with v4l2
@@ -303,7 +303,8 @@ To start scrcpy using a v4l2 sink:
```bash
scrcpy --v4l2-sink=/dev/videoN
-scrcpy --v4l2-sink=/dev/videoN -N # --no-display to disable mirroring window
+scrcpy --v4l2-sink=/dev/videoN --no-display # disable mirroring window
+scrcpy --v4l2-sink=/dev/videoN -N # short version
```
(replace `N` by the device ID, check with `ls /dev/video*`)
