[issue41824] Docs for typing.ForwardRef don't state that it was added in 3.7

[Guido van Rossum]

Change by Guido van Rossum <guido at python.org>:


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resolution:  -> fixed
stage: patch review -> resolved
status: open -> closed

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue41824>
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