GitLab Next

These docs are likely owned by the Monitor team.

This commit updates reference-style links on these pages to use
the more standard link style, since our style guide specifies we
should not use reference-style links.

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 (part 2)