Document new tp_iteritem function slot.

Author: markshannon

Doc/c-api/typeobj.rst

@@ -147,6 +147,8 @@ Quick Reference
    +------------------------------------------------+-----------------------------------+-------------------+---+---+---+---+
    | :c:member:`~PyTypeObject.tp_vectorcall`        | :c:type:`vectorcallfunc`          |                   |   |   |   |   |
    +------------------------------------------------+-----------------------------------+-------------------+---+---+---+---+
+   | [:c:member:`~PyTypeObject.tp_iteritem`]        | opaque function pointer           |                   |   |   |   |   |
+   +------------------------------------------------+-----------------------------------+-------------------+---+---+---+---+
    | [:c:member:`~PyTypeObject.tp_watched`]         | unsigned char                     |                   |   |   |   |   |
    +------------------------------------------------+-----------------------------------+-------------------+---+---+---+---+
 

Include/cpython/object.h

@@ -229,7 +229,7 @@ struct _typeobject {
 
     destructor tp_finalize;
     vectorcallfunc tp_vectorcall;
-    iteritemfunc tp_iteritem;
+    iteritemfunc tp_iteritem; /* Virtual iterator next function */
 
 
     /* bitset of which type-watchers care about this type */