[docs] [issue20202] ArgumentClinic howto: document change in Py_buffer lifecycle management

[Larry Hastings]

Larry Hastings added the comment:

I've got a bunch of doc improvements in the rollup patch in #20214.  I invite you to give it a review.  If that looks suitable please close this issue.

As for a verb, I've been using "convert".  "zlibmodule has already been converted to work with Argument Clinic".

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