Fixed #19072 -- Corrected an external file path in GeoIP docs

In order to perform IP-based geolocation, the :class:`GeoIP` object requires

the GeoIP C libary and either the GeoIP `Country`__ or `City`__ 

datasets in binary format (the CSV files will not work!).  These datasets may be 

`downloaded from MaxMind`__.  Grab the ``GeoIP.dat.gz`` and ``GeoLiteCity.dat.gz``

and unzip them in a directory corresponding to what you set 

:setting:`GEOIP_PATH` with in your settings.  See the example and reference below

for more details.

`downloaded from MaxMind`__.  Grab the ``GeoLiteCountry/GeoIP.dat.gz`` and

``GeoLiteCity.dat.gz`` files and unzip them in a directory corresponding to what

you set :setting:`GEOIP_PATH` with in your settings.  See the example and

reference below for more details.

__ http://www.maxmind.com/app/c

__ http://www.maxmind.com/app/python