pythongh-93738: Documentation C syntax (:c:type:PyTupleObject* -> :c:expr:PyTupleObject*) (pythonGH-97780)

:c:type:`PyTupleObject*` -> :c:expr:`PyTupleObject*`
(cherry picked from commit 510baa4)

Co-authored-by: Adam Turner <[email protected]>

Author: AA-Turner

Doc/c-api/typehints.rst

@@ -16,7 +16,7 @@ two types exist -- :ref:`GenericAlias <types-genericalias>` and
    :class:`types.GenericAlias`.  The *origin* and *args* arguments set the
    ``GenericAlias``\ 's ``__origin__`` and ``__args__`` attributes respectively.
    *origin* should be a :c:type:`PyTypeObject*`, and *args* can be a
-   :c:type:`PyTupleObject*` or any ``PyObject*``.  If *args* passed is
+   :c:expr:`PyTupleObject*` or any ``PyObject*``.  If *args* passed is
    not a tuple, a 1-tuple is automatically constructed and ``__args__`` is set
    to ``(args,)``.
    Minimal checking is done for the arguments, so the function will succeed even