iio: Improve the kernel-doc of iio_trigger_poll

Move the kernel-doc of the function to industrialio-trigger.c
Add a note on the context where the function is expected to be called.

Signed-off-by: Mehdi Djait <[e-mail]>
Reviewed-by: Andy Shevchenko <[e-mail]>
Link: https://lore.kernel.org/r/bd84f[e-mail]
Signed-off-by: Jonathan Cameron <[e-mail]>

drivers/iio/industrialio-trigger.c

···
 		schedule_work(&trig->reenable_work);
 }
 
+/**
+ * iio_trigger_poll() - Call the IRQ trigger handler of the consumers
+ * @trig: trigger which occurred
+ *
+ * This function should only be called from a hard IRQ context.
+ */
 void iio_trigger_poll(struct iio_trigger *trig)
 {
 	int i;

include/linux/iio/trigger.h

···
  **/
 int iio_trigger_set_immutable(struct iio_dev *indio_dev, struct iio_trigger *trig);
 
-/**
- * iio_trigger_poll() - called on a trigger occurring
- * @trig:	trigger which occurred
- *
- * Typically called in relevant hardware interrupt handler.
- **/
 void iio_trigger_poll(struct iio_trigger *trig);
 void iio_trigger_poll_chained(struct iio_trigger *trig);