[3.14] gh-141729: Doc PyTypeObject.tp_vectorcall grammar fix (GH-141730) (#141815)

gh-141729: Doc PyTypeObject.tp_vectorcall grammar fix (GH-141730)

[3.14] Doc PyTypeObject.tp_vectorcall grammar fix
(cherry picked from commit 20b69aac0d19a5e5358362410d9710887762f0e7)

Co-authored-by: Michael Kiper <77862413+michaelkiper@users.noreply.github.com>
Co-authored-by: makiper <michael.kiper@jpl.nasa.gov>