Bug#927322: Don't mention OSM current max zoom levels

[積丹尼 Dan Jacobson]

Package: libgeo-osm-tiles-perl
Version: 0.04-5
Severity: wishlist
File: /usr/share/man/man3/Geo::OSM::Tiles.3pm.gz

   "tile2path($tilex, $tiley, $zoom)" Composes the path to the tile at
       $tilex, $tiley, and $zoom at the OSM server. $tilex and $tiley
       must be integers in the range "0..2**$zoom-1". The supported
       range of zoom levels depends on the tile server. The maximum zoom
       for the Osmarender layer is 17, it is 18 for the Mapnik layer.


I believe 18 has changed. Perhaps don't mention actual numbers.