docs: video-output.txt: convert it to ReST format

This file doesn't follow the documentation style we use
within the Kernel. Fix it.
Signed-off-by: NMauro Carvalho Chehab <mchehab+samsung@kernel.org>
Signed-off-by: NJonathan Corbet <corbet@lwn.net>

Documentation/video-output.txt

+Video Output Switcher Control
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
-		Video Output Switcher Control
-		~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-		2006 luming.yu@intel.com
+2006 luming.yu@intel.com
 
 The output sysfs class driver provides an abstract video output layer that
 can be used to hook platform specific methods to enable/disable video output
 device through common sysfs interface. For example, on my IBM ThinkPad T42
 laptop, The ACPI video driver registered its output devices and read/write
-method for 'state' with output sysfs class. The user interface under sysfs is:
+method for 'state' with output sysfs class. The user interface under sysfs is::
 
-linux:/sys/class/video_output # tree .
-.
-|-- CRT0
-|   |-- device -> ../../../devices/pci0000:00/0000:00:01.0
-|   |-- state
-|   |-- subsystem -> ../../../class/video_output
-|   `-- uevent
-|-- DVI0
-|   |-- device -> ../../../devices/pci0000:00/0000:00:01.0
-|   |-- state
-|   |-- subsystem -> ../../../class/video_output
-|   `-- uevent
-|-- LCD0
-|   |-- device -> ../../../devices/pci0000:00/0000:00:01.0
-|   |-- state
-|   |-- subsystem -> ../../../class/video_output
-|   `-- uevent
-`-- TV0
-   |-- device -> ../../../devices/pci0000:00/0000:00:01.0
-   |-- state
-   |-- subsystem -> ../../../class/video_output
-   `-- uevent
+  linux:/sys/class/video_output # tree .
+  .
+  |-- CRT0
+  |   |-- device -> ../../../devices/pci0000:00/0000:00:01.0
+  |   |-- state
+  |   |-- subsystem -> ../../../class/video_output
+  |   `-- uevent
+  |-- DVI0
+  |   |-- device -> ../../../devices/pci0000:00/0000:00:01.0
+  |   |-- state
+  |   |-- subsystem -> ../../../class/video_output
+  |   `-- uevent
+  |-- LCD0
+  |   |-- device -> ../../../devices/pci0000:00/0000:00:01.0
+  |   |-- state
+  |   |-- subsystem -> ../../../class/video_output
+  |   `-- uevent
+  `-- TV0
+     |-- device -> ../../../devices/pci0000:00/0000:00:01.0
+     |-- state
+     |-- subsystem -> ../../../class/video_output
+     `-- uevent