regulator: dt-bindings: richtek,rt4801: minor comments adjustments

Correct grammar in 'enable-gpios' description and remove useless comment
about regulator nodes, because these are obvious from patternProperties.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20220401153711.1057853-1-krzysztof.kozlowski@linaro.org


Signed-off-by: Mark Brown <broonie@kernel.org>