regulator: fix a kernel-doc markup

It seems that the function was renamed. kernel-doc markup
should follow it.
Signed-off-by: NMauro Carvalho Chehab <mchehab+huawei@kernel.org>
Link: https://lore.kernel.org/r/dffad16d4d6427d7d0fc89797e4126fe7c69d5de.1603469755.git.mchehab+huawei@kernel.orgSigned-off-by: NMark Brown <broonie@kernel.org>

drivers/regulator/core.c

@@ -5529,7 +5529,7 @@ void regulator_set_drvdata(struct regulator *regulator, void *data)
 EXPORT_SYMBOL_GPL(regulator_set_drvdata);
 
 /**
- * regulator_get_id - get regulator ID
+ * rdev_get_id - get regulator ID
  * @rdev: regulator
  */
 int rdev_get_id(struct regulator_dev *rdev)