regulator: pf9453: Fix kernel doc for mux_poll()

The validator is not happy:

Warning: drivers/regulator/pf9453-regulator.c:303 This comment starts with '/**', but isn't a kernel-doc comment. Refer Documentation/doc-guide/kernel-doc.rst

Update the kernel-doc accordingly.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://patch.msgid.link/20251106114628.2302762-1-andriy.shevchenko@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>

Author: andy-shev

drivers/regulator/pf9453-regulator.c

@@ -289,13 +289,15 @@ static int pf9453_pmic_write(struct pf9453 *pf9453, unsigned int reg, u8 mask, u
 }
 
 /**
- * pf9453_regulator_enable_regmap for regmap users
+ * pf9453_regulator_enable_regmap - enable regulator for regmap users
  *
  * @rdev: regulator to operate on
  *
  * Regulators that use regmap for their register I/O can set the
  * enable_reg and enable_mask fields in their descriptor and then use
  * this as their enable() operation, saving some code.
+ *
+ * Return: %0 on success, or negative errno.
  */
 static int pf9453_regulator_enable_regmap(struct regulator_dev *rdev)
 {
@@ -314,13 +316,15 @@ static int pf9453_regulator_enable_regmap(struct regulator_dev *rdev)
 }
 
 /**
- * pf9453_regulator_disable_regmap for regmap users
+ * pf9453_regulator_disable_regmap - disable regulator for regmap users
  *
  * @rdev: regulator to operate on
  *
  * Regulators that use regmap for their register I/O can set the
  * enable_reg and enable_mask fields in their descriptor and then use
  * this as their disable() operation, saving some code.
+ *
+ * Return: %0 on success, or negative errno.
  */
 static int pf9453_regulator_disable_regmap(struct regulator_dev *rdev)
 {
@@ -339,14 +343,16 @@ static int pf9453_regulator_disable_regmap(struct regulator_dev *rdev)
 }
 
 /**
- * pf9453_regulator_set_voltage_sel_regmap for regmap users
+ * pf9453_regulator_set_voltage_sel_regmap - set voltage for regmap users
  *
  * @rdev: regulator to operate on
  * @sel: Selector to set
  *
  * Regulators that use regmap for their register I/O can set the
  * vsel_reg and vsel_mask fields in their descriptor and then use this
  * as their set_voltage_vsel operation, saving some code.
+ *
+ * Return: %0 on success, or negative errno.
  */
 static int pf9453_regulator_set_voltage_sel_regmap(struct regulator_dev *rdev, unsigned int sel)
 {
@@ -397,14 +403,16 @@ static int find_closest_bigger(unsigned int target, const unsigned int *table,
 }
 
 /**
- * pf9453_regulator_set_ramp_delay_regmap
+ * pf9453_regulator_set_ramp_delay_regmap - set ramp delay for regmap users
  *
  * @rdev: regulator to operate on
  * @ramp_delay: desired ramp delay value in microseconds
  *
  * Regulators that use regmap for their register I/O can set the ramp_reg
  * and ramp_mask fields in their descriptor and then use this as their
  * set_ramp_delay operation, saving some code.
+ *
+ * Return: %0 on success, or negative errno.
  */
 static int pf9453_regulator_set_ramp_delay_regmap(struct regulator_dev *rdev, int ramp_delay)
 {