Revert "Revert "Document Array.gist""
Revert "Revert "Document Array.gist""

This reverts commit 08c0b3656f24961a3df50e41c46fa254a29a87c9.

Method got brought back:
https://github.com/rakudo/rakudo/commit/08539c43d2
https://github.com/perl6/roast/commit/5a0beb5afb

MasterDuke17/doc,dmaestro/doc,stmuk/doc,stmuk/doc,tbrowder/doc,gfldex/doc,MasterDuke17/doc,tbrowder/doc,antquinonez/doc,dmaestro/doc,perl6/doc,stmuk/doc,perl6/doc,antquinonez/doc,jonathanstowe/doc,perl6/doc,jonathanstowe/doc,tbrowder/doc,jonathanstowe/doc,dmaestro/doc,jonathanstowe/doc,gfldex/doc,gfldex/doc,perl6/doc,gfldex/doc,dmaestro/doc,gfldex/doc,perl6/doc,antquinonez/doc,jonathanstowe/doc,stmuk/doc,antquinonez/doc,MasterDuke17/doc,MasterDuke17/doc,stmuk/doc,dmaestro/doc,antquinonez/doc,tbrowder/doc