regulator: irq_helpers: Fix regulator_irq_map_event_simple() kerneldoc

kernel-doc complains about missing "Return" section for the function
regulator_irq_map_event_simple().

Add a "Return" section for it based on its behavior. The function
actually always returns 0, but fills in fields in its @rid parameter as
needed. Expand the description of the parameter to cover this.

While at it fix a typo found in the description of the same function.
Reported-by: Matti Vaittinen <mazziesaccount@gmail.com>
Closes: https://lore.kernel.org/all/e341240e-1c1f-49a2-91cd-440888fdbda0@gmail.com/Signed-off-by: Chen-Yu Tsai <wenst@chromium.org>
Reported-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://patch.msgid.link/20240829085131.1361701-9-wenst@chromium.orgSigned-off-by: Mark Brown <broonie@kernel.org>

drivers/regulator/irq_helpers.c

@@ -404,16 +404,21 @@ EXPORT_SYMBOL_GPL(regulator_irq_helper_cancel);
 /**
  * regulator_irq_map_event_simple - regulator IRQ notification for trivial IRQs
  *
- * @irq:	Number of IRQ that occurred
- * @rid:	Information about the event IRQ indicates
- * @dev_mask:	mask indicating the regulator originating the IRQ
+ * @irq:	Number of IRQ that occurred.
+ * @rid:	Information about the event IRQ indicates.
+ *		The function fills in the &regulator_err_state->notifs
+ *		and &regulator_err_state->errors fields of
+ *		&regulator_irq_data->states as output.
+ * @dev_mask:	mask indicating the regulator originating the IRQ.
  *
  * Regulators whose IRQ has single, well defined purpose (always indicate
  * exactly one event, and are relevant to exactly one regulator device) can
- * use this function as their map_event callbac for their regulator IRQ
- * notification helperk. Exactly one rdev and exactly one error (in
+ * use this function as their map_event callback for their regulator IRQ
+ * notification helper. Exactly one rdev and exactly one error (in
  * "common_errs"-field) can be given at IRQ helper registration for
  * regulator_irq_map_event_simple() to be viable.
+ *
+ * Return: 0.
  */
 int regulator_irq_map_event_simple(int irq, struct regulator_irq_data *rid,
 			    unsigned long *dev_mask)