[3.14] gh-141004: correctly document `Py_HASH_*` and `PyHASH_*` as `hash_info` attributes (GH-141233) (#141234)

gh-141004: correctly document `Py_HASH_*` and `PyHASH_*` as `hash_info` attributes (GH-141233)
(cherry picked from commit 87942d911b8bc9e83caee3c0b699f0b0ba15daa9)

Co-authored-by: Bénédikt Tran <10796600+picnixz@users.noreply.github.com>