Changes indexing for [] and adds for [\]
Changes indexing for [] and adds for [\]

This closes #1559

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