Documentation: iio: fix a typo

Rename function name to the actual name referenced in
struct iio_sw_trigger_ops.
Signed-off-by: NLars Poeschel <poeschel@lemonage.de>
Link: https://lore.kernel.org/r/20200904091911.269715-1-poeschel@lemonage.deSigned-off-by: NJonathan Corbet <corbet@lwn.net>

Documentation/iio/iio_configfs.rst

@@ -53,7 +53,7 @@ kernel module following the interface in include/linux/iio/sw_trigger.h::
 	 */
   }
 
-  static int iio_trig_hrtimer_remove(struct iio_sw_trigger *swt)
+  static int iio_trig_sample_remove(struct iio_sw_trigger *swt)
   {
 	/*
 	 * This undoes the actions in iio_trig_sample_probe