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/func-mmap.rst b/Documentation/linux_tv/media/v4l/func-mmap.rst
index fb6e4cd..7243142 100644
--- a/Documentation/linux_tv/media/v4l/func-mmap.rst
+++ b/Documentation/linux_tv/media/v4l/func-mmap.rst
@@ -98,8 +98,8 @@
 address is a hint only, and is usually specified as 0.
 
 Suitable length and offset parameters are queried with the
-:ref:`VIDIOC_QUERYBUF <vidioc-querybuf>` ioctl. Buffers must be
-allocated with the :ref:`VIDIOC_REQBUFS <vidioc-reqbufs>` ioctl
+:ref:`VIDIOC_QUERYBUF <VIDIOC_QUERYBUF>` ioctl. Buffers must be
+allocated with the :ref:`VIDIOC_REQBUFS <VIDIOC_REQBUFS>` ioctl
 before they can be queried.
 
 To unmap buffers the :ref:`munmap() <func-munmap>` function is used.
@@ -125,7 +125,7 @@
     The ``flags`` or ``prot`` value is not supported.
 
     No buffers have been allocated with the
-    :ref:`VIDIOC_REQBUFS <vidioc-reqbufs>` ioctl.
+    :ref:`VIDIOC_REQBUFS <VIDIOC_REQBUFS>` ioctl.
 
 ENOMEM
     Not enough physical or virtual memory was available to complete the