Improve list markup for prob008-duff2
Improve list markup for prob008-duff2

For some reason the S26 numbered item syntax doesn't work yet, however at
present fixing the original numbered list to use a pod6 list is a bit of an
improvement.

shlomif/perl6-examples,perl6/perl6-examples,stmuk/perl6-examples,Quinny/perl6-examples,stmuk/perl6-examples,shlomif/perl6-examples,shlomif/perl6-examples,Quinny/perl6-examples,stmuk/perl6-examples,perl6/perl6-examples,stmuk/perl6-examples,shlomif/perl6-examples,perl6/perl6-examples,Quinny/perl6-examples,shlomif/perl6-examples,Quinny/perl6-examples,stmuk/perl6-examples,perl6/perl6-examples,Quinny/perl6-examples,perl6/perl6-examples