[issue38914] Clarify wording for warning message when checking a package

[Jürgen Gmach]

Jürgen Gmach <juergen.gmach at googlemail.com> added the comment:

Thank you for your feedback.

Paul Ganssle suggested a updated wording over at
https://github.com/pypa/pep517/issues/73
so this is why I created a pr accordingly.

The intent of this issue and the pr is to minimize the confusion for a beginner with Python packaging (e.g myself) by doing something with the probably wrong word "must".

Changing the checks is another way to fix this issue, but it is beyond my scope to say one is better or the other.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue38914>
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