regmap-irq: Fix typo in documentation for .get_irq_reg()

It refers to a non-existent "num_type_settings" value, which is
an old name I'd used during development of config registers and
later dropped because it wasn't very clear.

The correct bound for the range is num_config_regs, which can
be verified by checking the implementation.

Signed-off-by: Aidan MacDonald <aidanmacdonald.0x0@gmail.com
Link: https://lore.kernel.org/r/20230509110100.3980123-2-aidanmacdonald.0x0@gmail.com
Signed-off-by: Mark Brown <broonie@kernel.org

include/linux/regmap.h

@@ -1606,7 +1606,7 @@ struct regmap_irq_chip_data;
  *		 addresses. The base register will be one of @status_base,
  *		 @mask_base, etc., @main_status, or any of @config_base.
  *		 The index will be in the range [0, num_main_regs[ for the
- *		 main status base, [0, num_type_settings[ for any config
+ *		 main status base, [0, num_config_regs[ for any config
  *		 register base, and [0, num_regs[ for any other base.
  *		 If unspecified then regmap_irq_get_irq_reg_linear() is used.
  * @irq_drv_data:    Driver specific IRQ data which is passed as parameter when