[docs] [issue17370] PEP should note if it has been superseded

[Terry J. Reedy]

Terry J. Reedy added the comment:

I think you are, in effect, asking for expansion of the 'PEP Header Preamble' section of PEP-0001. I have added some of the PEP editors listed in the PEP as nosy. I will let them decide if this should be discussed elsewhere.

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nosy: +barry, brett.cannon, georg.brandl, terry.reedy

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