doc-rst: linux_tv: Replace reference names to match ioctls

Due to a limitation at the DocBook language, the references
were using lowercase and slashes, instead of the name of the
ioctls. On ReST, make them identical. This will hopefully
help to cleanup the code a little bit.

Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
diff --git a/Documentation/linux_tv/media/v4l/dev-event.rst b/Documentation/linux_tv/media/v4l/dev-event.rst
index afe24a7..5d21c68 100644
--- a/Documentation/linux_tv/media/v4l/dev-event.rst
+++ b/Documentation/linux_tv/media/v4l/dev-event.rst
@@ -14,9 +14,9 @@
 
 To receive events, the events the user is interested in first must be
 subscribed using the
-:ref:`VIDIOC_SUBSCRIBE_EVENT <vidioc-subscribe-event>` ioctl. Once
+:ref:`VIDIOC_SUBSCRIBE_EVENT <VIDIOC_SUBSCRIBE_EVENT>` ioctl. Once
 an event is subscribed, the events of subscribed types are dequeueable
-using the :ref:`VIDIOC_DQEVENT <vidioc-dqevent>` ioctl. Events may be
+using the :ref:`VIDIOC_DQEVENT <VIDIOC_DQEVENT>` ioctl. Events may be
 unsubscribed using VIDIOC_UNSUBSCRIBE_EVENT ioctl. The special event
 type V4L2_EVENT_ALL may be used to unsubscribe all the events the
 driver supports.