This directive creates a bullet-point list of all the attributes
defined within a file. The idea is to give a quick overview reference
for config file options.
There are two options to start with -- maxdepth is similar to the TOC
option and only shows certain levels of options; prefix allows to
filter down to a smaller set of options if required.
I've reworked the documentation examples as part of testing this. The
various components are moved into separate files. On the main page,
moved the config options into the main documentation (and use the zuul
attributes :) and pointed out that you can view the source of each
sample page to see how to generate what you see.