[io grant] Document IO::Handle.lines
[io grant] Document IO::Handle.lines

- Include &lines
- Clarify behaviour vis-a-vis laziness
- Document :$close
- Remove bad practices from example

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