Things change between releases. In this case, the difference is probably that perldoc has been re-written and now comes from the Pod::Perldoc package. Indeed, here's all of perldoc:

#!/usr/bin/perl
    eval 'exec /usr/bin/perl -S $0 ${1+"$@"}'
        if 0;

# This "perldoc" file was generated by "perldoc.PL"

require 5;
use Pod::Perldoc;
BEGIN { $^W = 1 if $ENV{'PERLDOCDEBUG'} }
exit( Pod::Perldoc->run() );
[download]

If you have a problem, you can send a bug report to the maintainer (hopefully with a patch). Good luck :)