Clarifies example in a control environment
Clarifies example in a control environment

This closes #2871; also closes #2551 since that's been cleared up already.

MasterDuke17/doc,perl6/doc,MasterDuke17/doc,perl6/doc,MasterDuke17/doc,tbrowder/doc,perl6/doc,tbrowder/doc,perl6/doc,MasterDuke17/doc,tbrowder/doc,tbrowder/doc,perl6/doc