go schemabuilder/reflect: Add comments to reflect.go types/funcs
go schemabuilder/reflect: Add comments to reflect.go types/funcs

Summary: Goes through the functions we've left in reflect.go and adds
comments to explain what each of the functions is doing.

samsarahq/thunder,samsarahq/thunder,samsarahq/thunder,samsarahq/thunder,samsarahq/thunder