[3.12] gh-102190: Add additional zipfile `pwd=` arg docstrings (gh-102195) (GH-117408)

gh-102190: Add additional zipfile `pwd=` arg docstrings (gh-102195)

This just documents the parameter that already exists.

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(cherry picked from commit a32d6939486d7f90ee57e215077f6116e19de24d)

Co-authored-by: Deborah <32307299+dlwrnc@users.noreply.github.com>
Co-authored-by: Gregory P. Smith <greg@krypto.org>
Co-authored-by: Erlend E. Aasland <erlend.aasland@protonmail.com>