Remove documentation of "val-or-fail"
Remove documentation of "val-or-fail"

This is an untested documentation detail of val() processing and
a hack to use the same code for numerification of strings.

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