doc-rst: linux_tv: split DVB function call documentation

Just like V4L, split the DVB function calls into one file per
system call. This is a requirement for the man pages creator
on Sphinx to work, and makes the document easier to maintain.

Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
diff --git a/Documentation/linux_tv/media/dvb/video-set-id.rst b/Documentation/linux_tv/media/dvb/video-set-id.rst
new file mode 100644
index 0000000..5a58405
--- /dev/null
+++ b/Documentation/linux_tv/media/dvb/video-set-id.rst
@@ -0,0 +1,69 @@
+.. -*- coding: utf-8; mode: rst -*-
+
+.. _VIDEO_SET_ID:
+
+VIDEO_SET_ID
+============
+
+Description
+-----------
+
+This ioctl selects which sub-stream is to be decoded if a program or
+system stream is sent to the video device.
+
+Synopsis
+--------
+
+.. c:function:: int ioctl(int fd, int request = VIDEO_SET_ID, int id)
+
+Arguments
+----------
+
+
+
+.. flat-table::
+    :header-rows:  0
+    :stub-columns: 0
+
+
+    -  .. row 1
+
+       -  int fd
+
+       -  File descriptor returned by a previous call to open().
+
+    -  .. row 2
+
+       -  int request
+
+       -  Equals VIDEO_SET_ID for this command.
+
+    -  .. row 3
+
+       -  int id
+
+       -  video sub-stream id
+
+
+Return Value
+------------
+
+On success 0 is returned, on error -1 and the ``errno`` variable is set
+appropriately. The generic error codes are described at the
+:ref:`Generic Error Codes <gen-errors>` chapter.
+
+
+
+.. flat-table::
+    :header-rows:  0
+    :stub-columns: 0
+
+
+    -  .. row 1
+
+       -  ``EINVAL``
+
+       -  Invalid sub-stream id.
+
+
+