[issue40066] Enum: modify __repr__, __str__; update docs

[Ethan Furman]

Ethan Furman <ethan at stoneleaf.us> added the comment:

vstinner wrote:
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>>    self.assertEqual(repr(type), '<SocketKind.SOCK_STREAM: 1>')

> For this one, I suggest to replace the value with "..." doctest pattern.

That bit of code is from the unittest suite, not the doctest suite.

I went with:  

    self.assertEqual(repr(type), '<SocketKind.SOCK_STREAM: %r>' % type.value)

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