[issue14129] Corrections for the "extending" doc

[Éric Araujo]

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

> "in this case, nothing more than every Python object contains"
> There's a grammar error lurking somewhere in there...

It could be: “nothing more that what every Python object contains”.

Could you post a patch for review?

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue14129>
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