Update packaging-projects.rst to detail saving to .pypirc

[ekohilas]

Possible solution to pypa/packaging-problems#841

(although more likely a bug with twine)

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📚 Documentation preview 📚: https://python-packaging-user-guide--1654.org.readthedocs.build/en/1654/

[merwok]

.pypirc is the old way of saving credentials, with its own usability and security concerns.
It should not be recommended over an interactive prompt (the current doc).

[ekohilas]

.pypirc is the old way of saving credentials, with its own usability and security concerns. It should not be recommended over an interactive prompt (the current doc).

Thanks for letting me know! Would seem to be an issue with twine then.