Document license(), credits() and copyright()

[StanFromIreland]

As suggested by @picnixz

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📚 Documentation preview 📚: https://cpython-previews--138992.org.readthedocs.build/

[AA-Turner]

I'm not sure if we should document these in functions.rst, they're added by site and not 'proper' builtins.

Perhaps move to site.rst or expand the entries in constants.rst?

A

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[StanFromIreland]

I'm not sure if we should document these in functions.rst, they're added by site and not 'proper' builtins.

help() is already documented, it notes that it is added by site. I guess we could move them to a separate section like the constants?