Documentation for ghpythonlib?

Hi I am really new to this, but where can I find the documentation for ghpythonlib online?
Like today, I am trying to understand the ghpythonlib.treehelpers but having some problems with finding anything about it online
Thanks a lot

The lower left section at the bottom of this page may help:

The tree helpers are covered in a guide there also.

Thank you Scott. Is there a plan to have some page for it similar to the rest of API reference in the future?