Those plugins will register taxonomies and could possibly work from the WP admin dashboard under the “BuddyPress Docs” menu item.
However, because BP Docs Wiki is a frontend plugin, users won’t be able to see an area to add those custom taxonomy terms. So, in the meantime, you’d probably need to create a plugin to accomplish what you want.
If you have experience developing WordPress plugins, check out the BP Docs Wiki code here:
https://github.com/boonebgorges/buddypress-docs-wiki
And you should also check out the BP Docs plugin, which powers the Wiki plugin here:
https://github.com/boonebgorges/buddypress-docs