Adds a section on the identity operator
Adds a section on the identity operator

Which refs #2129. Missing is a link from where this is used.

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