Reorganize workflow docs
Reorganize workflow docs

This change organizes the workflow docs by topic rather than letting
autodoc organize methods by the order they appear in the _proxy.py file.

Change-Id: I3f220829ae7039a38bf76dee59131fce11af95f0

briancurtin/python-openstacksdk,openstack/python-openstacksdk,briancurtin/python-openstacksdk,stackforge/python-openstacksdk,openstack/python-openstacksdk,dtroyer/python-openstacksdk,dtroyer/python-openstacksdk,stackforge/python-openstacksdk