gh-141004: Document PyException_HEAD and PyDescr_COMMON

Doc/c-api/descriptor.rst

@@ -10,11 +10,6 @@ found in the dictionary of type objects.
 
 .. XXX document these!
 
-.. c:var:: PyTypeObject PyProperty_Type
-
-   The type object for the built-in descriptor types.
-
-
 .. c:function:: PyObject* PyDescr_NewGetSet(PyTypeObject *type, struct PyGetSetDef *getset)
 
 
@@ -74,9 +69,26 @@ found in the dictionary of type objects.
 .. c:function:: PyObject* PyWrapper_New(PyObject *, PyObject *)
 
 
+.. c:macro:: PyDescr_COMMON
+
+   This is a :term:`soft deprecated` macro including the common fields for a
+   descriptor object.
+
+   This was included in Python's C API by mistake; do not use it in extensions.
+   For creating custom descriptor objects, create a class implementing the
+   descriptor protocol (:c:member:`~PyTypeObject.tp_descr_get` and
+   :c:member:`~PyTypeObject.tp_descr_set`).
+
+
 Built-in descriptors
 ^^^^^^^^^^^^^^^^^^^^
 
+.. c:var:: PyTypeObject PyProperty_Type
+
+   The type object for property objects. This is the same object as
+   :class:`property` in the Python layer.
+
+
 .. c:var:: PyTypeObject PySuper_Type
 
    The type object for super objects. This is the same object as

Doc/c-api/exceptions.rst

@@ -793,6 +793,17 @@ Exception Classes
    Return :c:member:`~PyTypeObject.tp_name` of the exception class *ob*.
 
 
+.. c:macro:: PyException_HEAD
+
+   This is a :term:`soft deprecated` macro including the base fields for an
+   exception object.
+
+   This was included in Python's C API by mistake and is not designed for use
+   in extensions. For creating custom exception objects, use
+   :c:func:`PyErr_NewException` or otherwise create a class inheriting from
+   :c:data:`PyExc_BaseException`.
+
+
 Exception Objects
 =================