Make some global variables part of the public API #19569
Merged
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These are all useful to be able to tell users to rely on them and we've used them long enough for it to make sense as a public API.
Relatedly, these are all used in at least some Homebrew/homebrew-core or Homebrew/homebrew-cask formulae.
While we're here, update the descriptions to be a bit more user friendly.
See #19554 for motivation.