regulator: fix bullet lists of regulator_ops comment

regulator: fix bullet lists of regulator_ops comment

Since 89a6a5e56c82("regulator: add property parsing and callbacks to set protection limits")
which introduced a warning:

Documentation/driver-api/regulator:166: ./include/linux/regulator/driver.h:96: WARNING: Unexpected indentation.
Documentation/driver-api/regulator:166: ./include/linux/regulator/driver.h:98: WARNING: Block quote ends without a blank line; unexpected unindent.

Let's fix them.

Signed-off-by: Yanteng Si <siyanteng@loongson.cn>
Link: https://lore.kernel.org/r/20211207123230.2262047-1-siyanteng@loongson.cn
Signed-off-by: Mark Brown <broonie@kernel.org>