[3.15] gh-126970: Correct LOAD_GLOBAL stack order documentation (GH-159851) (#160349)

(cherry picked from commit 79a9ca0)

Co-authored-by: limadog9 <jakewallin42@gmail.com>

Author: miss-islington

Doc/library/dis.rst

@@ -1433,10 +1433,14 @@ iterations of the loop.
 .. opcode:: LOAD_GLOBAL (namei)
 
    Loads the global named ``co_names[namei>>1]`` onto the stack.
+   If the low bit of ``namei`` is set, a ``NULL`` is pushed onto the stack
+   after the global variable.
 
    .. versionchanged:: 3.11
-      If the low bit of ``namei`` is set, then a ``NULL`` is pushed to the
-      stack before the global variable.
+      The low bit of ``namei`` indicates whether a ``NULL`` is pushed.
+
+   .. versionchanged:: 3.13
+      The ``NULL`` is pushed after the global variable, rather than before it.
 
 .. opcode:: LOAD_FAST (var_num)