Many code blocks are 4spaced, and they render in GitLab
without coloring as a result, even though they are
fenced with a language label. If in a list, other items
will render as being in a code block too, even if not
meant to. This fixes all these issues for many admin
docs in /high_availability and /auth (part 1)
There are several instances in our HA docs where an example of
`Y.Y.Y.Y consul1.gitlab.example.com Z.Z.Z.Z` is given,
but this value isn't explicitly stated. It should be
the IP addresses or DNS records of the Consul server nodes.
Updating documentation to include
Prometheus Service Discovery. Added
monitoring node documentaiton as
well as documentation for the
individual service nodes.