[docs] [issue33235] Better help text for dict.setdefault

[Éric Araujo]

Éric Araujo <merwok at netwok.org> added the comment:

The two lines are equivalent!

`d.setdefault(key, default)` does return the same thing as `d.get(key, default)`, and then sets `d[key] = default` if the get method went into the “key was not found, let’s return default” branch.

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nosy: +eric.araujo

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue33235>
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