bpo-44263: Better explain the GC contract for PyType_FromSpecWithBases (GH-26442) (GH-26443)

(cherry picked from commit 8b55bc3f93a655bc803bff79725d5fe3f124e2f0)

Co-authored-by: Pablo Galindo <Pablogsal@gmail.com>

Co-authored-by: Pablo Galindo <Pablogsal@gmail.com>
2 files changed