Where is the script reference for "order in layer" and "sorting layer"

I found in the 2D kit tutorial project that you can actually dynamically change the
rendering sorting layer and order in layer by access the

Renderer.sortingLayer

property. I can google it but however when I use the search function in scripting reference. No such variables found in Renderer’s page too.
Is this a miss of the scripting reference or the property itself is a temporary interface?

It’s in the docs (though the amount of detail is slightly underwhelming…), and is listed in the reference for the SpriteRenderer component (though it should also be listed under Renderer, and currently appears to only be listed under SpriteRenderer in the local docs, not the online docs).