Comment use of macupdate

@vitorgalvao, @ndr-qef, the first two are cases where I would use `license :abandoned`.

It would seem prudent to print a warning in such cases.
It’s something I’d correct to a single space (for stylistic reasons) if I found it in a cask. I was asking to know if it’s something I should leave be in the future (because it was intentional), or something you missed.

I may have made such changes in the past, so I was asking for the opposite reason: to know if it was bad to have it as a single space.