Explain how gather/take works with hashes
Explain how gather/take works with hashes

Fixes #2479.

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