Mike McQuaid c3dc8862c1
os/mac/xcode: better document upgrade.
Explain when these various versions should (and should not) be bumped
and provide a method to avoid people having to schlep through the Apple
Developer site unless they really want to.

Also, while we're here, DRY things up and reorder to "newest first".
2020-04-09 14:27:39 +01:00
..
2020-04-07 09:58:26 +01:00