Add a note about Junctions on the RHS of ~~
Add a note about Junctions on the RHS of ~~

Resolves #1343.

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