[docs] [issue27723] Document typing.Text and typing.AnyStr

[Ivan Levkivskyi]

Ivan Levkivskyi added the comment:

Thank you for the patch, Michael!
I could add a comment that probably it is better to mention the definition of AnyStr = TypeVar('AnyStr', str, bytes) at beginning and only then go with examples.

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nosy: +levkivskyi

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<http://bugs.python.org/issue27723>
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