staging:iio: Update iio_event_interface documentation

The documentation for the iio_event_interface does not match the actual struct
anymore. This patch removes the documentation for non-existing fields and adds
documentation for missing fields.
Signed-off-by: NLars-Peter Clausen <lars@metafoo.de>
Acked-by: NJonathan Cameron <jic23@kernel.org>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/iio/industrialio-core.c

@@ -112,13 +112,14 @@ struct iio_detected_event_list {
 
 /**
  * struct iio_event_interface - chrdev interface for an event line
- * @dev:		device assocated with event interface
  * @wait:		wait queue to allow blocking reads of events
  * @event_list_lock:	mutex to protect the list of detected events
  * @det_events:		list of detected events
  * @max_events:		maximum number of events before new ones are dropped
  * @current_events:	number of events in detected list
+ * @dev_attr_list:	list of event interface sysfs attribute
  * @flags:		file operations related flags including busy flag.
+ * @group:		event interface sysfs attribute group
  */
 struct iio_event_interface {
 	wait_queue_head_t			wait;