In ScanCode.io v35.3.0 the Download URLs field under Input shows it accepts package URLs with format pkg://type/name@version but per https://github.com/package-url/purl-spec it should be like pkg:type/name@version

Propose we change pkg://type/name@version to pkg:type/name@version and maybe add an example like pkg:pypi/django@1.11.1 to end up with something like pkg:type/name@version (e.g.: pkg:pypi/django@1.11.1)