[issue39128] Document happy eyeball parameters in loop.create_connection signature docs

[Julien Palard]

Julien Palard <julien+python at palard.fr> added the comment:

I merged the first PR about adding parameter, but I'm not closing this issue yet, as Andrew said, a small chapter with a description of Happy Eyeballs algorithm would be nice, if anyone want to write a PR, go for it.

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<https://bugs.python.org/issue39128>
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