Add ability to document Python Toolboxes from within pyt file.

[JeffJacobson]

I would like to be able to add documentation to my Python Toolboxes inside of the pyt file instead of creating the documentation through ArcGIS Desktop "Item Description" process (which generates XML files).

Using the existing method, sometimes if I add a parameter to a Python Toolbox tool, the XML files will be regenerated and I have to redo all of the documentation from scratch.  Not cool.

[ShaunWalbridge]

Not a direct solution to this issue, but one thing that does help is adding your XML files to a version control system -- I do this with all of the documentation, and this allows you to move between versions easily. The issue of XML regeneration has been fixed, at 10.1SP1 if you add parameters, I can confirm the rest of the help is retained.