Update preallocated integer range in long.rst documentation

Author: tdadela

Doc/c-api/long.rst

@@ -43,7 +43,7 @@ distinguished from a number.  Use :c:func:`PyErr_Occurred` to disambiguate.
    .. impl-detail::
 
       CPython keeps an array of integer objects for all integers
-      between ``-5`` and ``256``.  When you create an int in that range
+      between ``-5`` and ``1024``.  When you create an int in that range
       you actually just get back a reference to the existing object.