readability edits for CEP-21 #130
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While reading https://github.com/conda/ceps/blob/main/cep-0021.md for work on #129, I noticed some minor issues, which I'm suggesting to fix here.
The big issue that I don't know how to fix is that the "Specification" section is IMO mislabeled, as it only contains discussion of reasons that CEP 12 had brought for not embedding run-exports into the regular repodata. The only language that uses authoritative keywords (MAY, MUST) is under "Patching" (though that's also mixed with non-technical language, e.g. "We do not see a reason how [...]"), so presumably that must be the entirety of the specification?
CC @baszalmstra