More clear documentation for NonNull<T> #79841
Merged
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Rephrase and hopefully clarify the discussion of covariance in
NonNull<T>
documentation.I'm very much not an expert so someone should definitely double check the correctness of what I'm saying. At the same time, the new language makes more sense to me, so hopefully it also is more logical to others whose knowledge of covariance basically begins and ends with the Rustonomicon chapter.
Related to #48929.