[issue46282] return value of builtins is not clearly indicated

[James Gerity]

James Gerity <snoop.jedi at gmail.com> added the comment:

> advertising that all functions default to returning None

This is already communicated in § 4.7 ("Defining Functions") of the official tutorial. 

I think it would be a good idea to revise that section so that this property of functions is a little more clear, but that isn't the scope of this ticket.

The title change reflects my intent to submit a PR that adds a hint to the builtins doc.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue46282>
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