Documents `encoding`
Documents `encoding`

And all new options included in March, including `replacement`. Closes #1233

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