Update torch brightness max level description.

     * flashlight brightness level via

     * {@link android.hardware.camera2.CameraManager#turnOnTorchWithStrengthLevel }.

     * If this value is equal to 1, flashlight brightness control is not supported.

     * The value for this key will be null for devices with no flash unit.

     * This level must be set to a safe value to prevent any burn out issues.</p>

     * The value for this key will be null for devices with no flash unit.</p>

     * <p>The maximum value is guaranteed to be safe to use for an indefinite duration in

     * terms of device flashlight lifespan, but may be too bright for comfort for many

     * use cases. Use the default torch brightness value to avoid problems with an

     * over-bright flashlight.</p>

     * <p><b>Optional</b> - The value for this key may be {@code null} on some devices.</p>

     */

    @PublicKey