Improve descriptions of `lifx.effect_sky` action (#140400)

* Improve descriptions of `lifx.effect_sky` action

The 'Sky Effect' action of the LIFX integration allows three types of sky types to choose from:
- "Clouds"
- "Sunrise"
- "Sunset"
This commit fixes the wrong naming of the "Clouds" effect as "Cloud" and adds details about it to the descriptions of the `cloud_saturation_min`and `cloud_saturation_max` fields (from the online docs).

In addition the inconsistent capitalization of their `name` strings is fixed, too.

* Improve action description as well