Modify docs to specify working of device flag
Modify the docker run docs, to specify working of --device flag
in containers that are started in privileged mode. The custom device
permissions that are given to a device in privileged mode are ignored
and goes with `rwm` by default
@@ -560,7 +560,8 @@ device or audio device can be added to an otherwise unprivileged container
By default, the container will be able to `read`, `write` and `mknod` these devices.
This can be overridden using a third `:rwm` set of options to each `--device`
-flag:
+flag. If the container is running in privileged mode, then the permissions specified
+will be ignored.
```bash
$ docker run --device=/dev/sda:/dev/xvdc --rm -it ubuntu fdisk /dev/xvdc
