add new pod6 doc for valid opener brackets
add new pod6 doc for valid opener brackets

tbrowder/doc,perl6/doc,tbrowder/doc,tbrowder/doc,MasterDuke17/doc,MasterDuke17/doc,perl6/doc,tbrowder/doc,perl6/doc,MasterDuke17/doc,perl6/doc,perl6/doc,MasterDuke17/doc