README: adjust config examples to Slackware's current format

I apparently had a (very) old /etc/httpd/mod_php.conf laying around on which the
original code was based.  Turns out Slackware doesn't add any '.new' version of
mod_php.conf upon package upgrade (only mod_php.conf.example gets updated) so it
went unnoticed until I tested the package on a clean install...

Updated the examples to the format as used in Slackware 14.0.