[issue34015] doc Add link to Descriptor HowTo Guide in Data Model

[INADA Naoki]

INADA Naoki <songofacandy at gmail.com> added the comment:

I think "See also" is better than sidebar.
Many other sections in data-model chapter have it.

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nosy: +inada.naoki

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<https://bugs.python.org/issue34015>
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