bpo-40429: PyFrame_GetCode() now returns a strong reference (GH-19773)

diff --git a/Doc/c-api/reflection.rst b/Doc/c-api/reflection.rst
index 594c1ec..21d9878 100644
--- a/Doc/c-api/reflection.rst
+++ b/Doc/c-api/reflection.rst
@@ -33,10 +33,11 @@
 
 .. c:function:: int PyFrame_GetCode(PyFrameObject *frame)
 
-   Return a borrowed reference to the *frame* code.
-   The frame code cannot be ``NULL``.
+   Get the *frame* code.
 
-   *frame* must not be ``NULL``.
+   Return a strong reference.
+
+   *frame* must not be ``NULL``. The result (frame code) cannot be ``NULL``.
 
    .. versionadded:: 3.9