Add the definition of booleans to the docs including some instruction on how to use them:

• autocomplete
• PoSH $true and $false

Our definition is:

Booleans are case-insensitive, and are represented by the following values.
True: 1, yes, true, on
False: 0, no, false, off

A good place for this would be the using guide.

This issue is blocked by #3914 and #3986