mfd: axp20x: Correct a typo in axp20x_device_remove documentation

The documentation of axp20x_device_remove() have a typo and use
axp20x_device_probe() as name. This patch fix this typo.
Signed-off-by: Corentin Labbe <clabbe.montjoie@gmail.com>
Acked-by: Chen-Yu Tsai <wens@csie.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>

include/linux/mfd/axp20x.h

@@ -582,7 +582,7 @@ int axp20x_match_device(struct axp20x_dev *axp20x);
 int axp20x_device_probe(struct axp20x_dev *axp20x);
 
 /**
- * axp20x_device_probe(): Remove a axp20x device
+ * axp20x_device_remove(): Remove a axp20x device
  *
  * @axp20x: axp20x device to remove
  *