The index of the administration manual has a list of repository types

and hosting services, which are displayed as a single line with a "|"

separating each entry. This wasn't the best layout for this, and a "|"

was even missing.
This change switches these entries to use Sphinx's hlist:: directive,

which creates a nice multi-column layout (2 columns for HTML/pickle),

creating a much nicer view for these lists.

Built the docs. Checked the resulting lists.