Add a short struct description and remove one extraneous struct field
description to quieten these warnings:

leds-lm3601x.c:73: warning: missing initial short description on line:
 * struct lm3601x_led -
leds-lm3601x.c:100: warning: Excess struct member 'led_name' description in 'lm3601x_led'
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Acked-by: Vadim Pasternak <vadimp@nvidia.com>
Link: https://lore.kernel.org/r/20240229071931.7870-2-rdunlap@infradead.orgSigned-off-by: Lee Jones <lee@kernel.org>