[docs] [issue37590] Remove redundant docs of PyEval_EvalFrameEx

[hai shi]

hai shi <shihai1991 at 126.com> added the comment:

sorry, the upstair's comment is wrong

PyEval_EvalFrameEx have been updated. so remove redundant info：`It is literally 2000 lines long.`

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<https://bugs.python.org/issue37590>
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