Document Real.Bridge
Document Real.Bridge

A bit long-winded, but includes a real-ish example of use.

Closes https://github.com/perl6/doc/issues/1690 D#1690
Part of https://github.com/rakudo/rakudo/pull/1522 R#1522

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