[3.13] `zlib.rst`: Link to constants and deduplicate text (GH-140115) (GH-140350)

* Link to compression setting constants from compression functions
* De-duplicate descriptions of the constants
(cherry picked from commit 091e8513bb58747ade56a03fccb98e220c7722cc)

Co-authored-by: Stan Ulbrych <89152624+StanFromIreland@users.noreply.github.com>
Co-authored-by: Victor Stinner <vstinner@python.org>

Emma Smith committed 7mo ago

df35beb6de43066b3321e00e7e764ef7cf641bce

Parent: cd6b272

Committed by GitHub <noreply@github.com> on 10/21/2025, 9:45:02 PM