[3.12] `functools.partial` docs: Use the more common spelling for "referenceable" (GH-113675) (#113677)

`functools.partial` docs: Use the more common spelling for "referenceable" (GH-113675)
(cherry picked from commit 4de468cce106221968d7ac08ddd94571b903c194)

Co-authored-by: Rodrigo Girão Serrão <5621605+rodrigogiraoserrao@users.noreply.github.com>