Document PEP 585, 563, 604 and more.#9763

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JukkaL merged 9 commits intopython:masterfrom

hauntsaninja:docs

Jan 6, 2021

Commits on Nov 28, 2020

Document PEP 585, 563, 604 and more.
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more edits
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more edits
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Commits on Dec 11, 2020

make string literal types use with future annotations more explicit
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cross reference generic classes
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fix nits
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reference previous discussion in forward references
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mention py39 in runtime generics section
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Commits on Dec 29, 2020

Mention conditional import of typing_extensions
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