[docs] [issue34942] Add an FAQ note about floating point representation

[Martin Panter]

Martin Panter <vadmium+py at gmail.com> added the comment:

Have you seen <https://docs.python.org/3/faq/design.html#why-are-floating-point-calculations-so-inaccurate>? It already links to the tutorial.

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nosy: +martin.panter

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<https://bugs.python.org/issue34942>
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