[S05] clarify how :x and :nth interact
[S05] clarify how :x and :nth interact

git-svn-id: 53605643c415f7495558be95614cf14171f1db78@30770 c213334d-75ef-0310-aa23-eaa082d1ae64

perl6/specs,perl6/specs,prammer/specs,tokuhirom/specs,prammer/specs,prammer/specs,tokuhirom/specs,tokuhirom/specs