[media] DocBook media: add revision entry for 3.15

[m.chehab@samsung.com: removed "Opening and Closing Devices" from the
 list of changes, as the patch with such change weren't applied]
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>

Documentation/DocBook/media/v4l/v4l2.xml

@@ -141,6 +141,16 @@ structs, ioctls) must be noted in more detail in the history chapter
 (compat.xml), along with the possible impact on existing drivers and
 applications. -->
 
+      <revision>
+	<revnumber>3.15</revnumber>
+	<date>2014-02-03</date>
+	<authorinitials>hv</authorinitials>
+	<revremark>Update several sections of "Common API Elements":
+"Querying Capabilities", "Application Priority", "Video Inputs and Outputs", "Audio Inputs and Outputs"
+"Tuners and Modulators", "Video Standards" and "Digital Video (DV) Timings".
+	</revremark>
+      </revision>
+
       <revision>
 	<revnumber>3.14</revnumber>
 	<date>2013-11-25</date>