mapserver/docs — pull request #96 by stecyr (2014-04-03 18:18:35+00:00)
Title: add comment about read only tileset and zoom

From http://osgeo-org.1560.x6.nabble.com/MapCache-returning-blank-tiles-when-outside-restricted-extents-td4373381.html for the read only tileset
and from the https://github.com/mapserver/mapcache/blob/master/mapcache.xml.sample for the min max zoom restriction