[media] Docbook: Fix comments at v4l2-async.h

Warning(.//include/media/v4l2-async.h:62): No description found for parameter 'match_type'
Warning(.//include/media/v4l2-async.h:62): Excess struct/union/enum/typedef member 'bus_type' description in 'v4l2_async_subdev'
Warning(.//include/media/v4l2-async.h:76): cannot understand function prototype: 'struct v4l2_async_notifier '

Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
Acked-by: Jonathan Corbet <corbet@lwn.net>

include/media/v4l2-async.h

@@ -32,7 +32,8 @@ enum v4l2_async_match_type {
 
 /**
  * struct v4l2_async_subdev - sub-device descriptor, as known to a bridge
- * @bus_type:	subdevice bus type to select the appropriate matching method
+ *
+ * @match_type:	type of match that will be used
  * @match:	union of per-bus type matching data sets
  * @list:	used to link struct v4l2_async_subdev objects, waiting to be
  *		probed, to a notifier->waiting list
@@ -62,8 +63,9 @@ struct v4l2_async_subdev {
 };
 
 /**
- * v4l2_async_notifier - v4l2_device notifier data
- * @num_subdevs:number of subdevices
+ * struct v4l2_async_notifier - v4l2_device notifier data
+ *
+ * @num_subdevs: number of subdevices
  * @subdevs:	array of pointers to subdevice descriptors
  * @v4l2_dev:	pointer to struct v4l2_device
  * @waiting:	list of struct v4l2_async_subdev, waiting for their drivers