Add some documentation for <( and )> capture markers
Add some documentation for <( and )> capture markers

Issue #462

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