[Skeletal Controllers] Any documents about this ? and How to use IK to aim in 3rd person

Hi,
Do any one know where to find the document about Skeletal Controller ??
Basically, i want to make my character to aim using the IK, and on all the sample project there’s nothing much about this.

The main Skeletal Control documentation is here:

There is also a page just on IK here:

thanks you