[media] device-drivers.tmpl: better organize DVB function calls

Classify the functions at the DVB core per API. That makes easier
to understand how they're related to the userspace API.

Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
diff --git a/drivers/media/dvb-core/demux.h b/drivers/media/dvb-core/demux.h
index f8014aa..f716e14 100644
--- a/drivers/media/dvb-core/demux.h
+++ b/drivers/media/dvb-core/demux.h
@@ -33,7 +33,7 @@
 #include <linux/dvb/dmx.h>
 
 /**
- * DOC: Digital TV Demux API
+ * DOC: Digital TV Demux
  *
  * The kernel demux API defines a driver-internal interface for registering
  * low-level, hardware specific driver to a hardware independent demux layer.
@@ -231,7 +231,7 @@
 };
 
 /**
- * DOC: Demux Callback API
+ * DOC: Demux Callback
  *
  * This kernel-space API comprises the callback functions that deliver filtered
  * data to the demux client. Unlike the other DVB kABIs, these functions are