Search all loaded macro namespaces for doc
Search all loaded macro namespaces for doc

Previously, had a hard-coded search through a few macro namespaces. Revises this to look through all loaded macro namespaces.

Fixes #181

slipset/planck,mfikes/planck,mfikes/planck,ericstewart/planck,slipset/planck,mfikes/planck,slipset/planck,mfikes/planck,slipset/planck,mfikes/planck,ericstewart/planck,ericstewart/planck,slipset/planck,mfikes/planck