If you create a Python Toolbox its good practise to document the parameters to guide the users. You do that by editing the item description. This creates an XML file that sits in the folder where the PYT file is.
If your toolbox had let say 100 tools and you judiciously documented them all via the item description then you end up with 100 XML files in the same folder.
Is it possible to move them into a sub-folder and some how have the toolbox point to that location so that when a user interacts with a tool they benefit from all the parameter information?