Add New Zealand mirror, and delete one line of whitespace.

PR: docs/11015
Submitted by: junkmale@xtra.co.nz

Update the list of AFS mirrors, and reformat as <programlisting>.
Apparently the listing should show the entries as they would
appear in a CellServDB file.

No PR associated with this change.

Submitted by: Love <lha@stacken.kth.se>