media: dvbapi.rst: add an entry to DVB revision history

There are several missing items at the API history. Yet,
as we're doing a significant change there, add a new entry.
Signed-off-by: NMauro Carvalho Chehab <mchehab@s-opensource.com>

Documentation/media/uapi/dvb/dvbapi.rst

@@ -66,12 +66,17 @@ Authors:
 
 **Copyright** |copy| 2002-2003 : Convergence GmbH
 
-**Copyright** |copy| 2009-2016 : Mauro Carvalho Chehab
+**Copyright** |copy| 2009-2017 : Mauro Carvalho Chehab
 
 ****************
 Revision History
 ****************
 
+:revision: 2.2.0 / 2017-09-01 (*mcc*)
+
+Most gaps between the uAPI document and the Kernel implementation
+got fixed for the non-legacy API.
+
 :revision: 2.1.0 / 2015-05-29 (*mcc*)
 
 DocBook improvements and cleanups, in order to document the system calls