Changes =item to =head4 sections
Changes =item to =head4 sections

This refs #2483

I leave the issue open just in case some other similar pages are found

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