Add an example for <!{}>.
Add an example for <!{}>.

Close #1757

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