Adds example to grammar tutorial
Adds example to grammar tutorial

Including use of $/, as requested by #2210.

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