[media] doc-rst: add some needed escape codes

Some extra escape codes are needed to avoid Sphinx to not
identify the tags.

Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
diff --git a/include/media/v4l2-dev.h b/include/media/v4l2-dev.h
index 5921c245..a122b1b 100644
--- a/include/media/v4l2-dev.h
+++ b/include/media/v4l2-dev.h
@@ -374,13 +374,13 @@
  *
  * @vdev: pointer to &struct video_device
  *
- * Can also be used for video_device->release().
+ * Can also be used for video_device->release\(\).
  */
 void video_device_release(struct video_device *vdev);
 
 /**
  * video_device_release_empty - helper function to implement the
- * 	video_device->release() callback.
+ * 	video_device->release\(\) callback.
  *
  * @vdev: pointer to &struct video_device
  *