[TS/TC][89134670] Add notes re: modules and object extensions
[TS/TC][89134670] Add notes re: modules and object extensions

After spiking out how module attributes might work, we're still not
sure, but we do think that Attrocity.module is misnamed. It's current
purpose is not really about moduleness, it's more about object
extension. So, Attrocity.module should be renamed to something like
Attrocity.module_extension. That will clarify other module work going
forward.

rentpath/attrocity,tjstankus/attrocity