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The dgpu_disable attribute was not documented, this adds the
required documentation.

Fixes: 98829e84

 ("asus-wmi: Add dgpu disable method")
Signed-off-by: Luke D. Jones <luke@ljones.dev>
Link: https://lore.kernel.org/r/20220812222509.292692-2-luke@ljones.dev

Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>