[3.13] Fix typo in `Doc/c-api/code.rst` (GH-140586) (#140592)

Fix typo in `Doc/c-api/code.rst` (GH-140586)
(cherry picked from commit d74a96366df58b6e55d4a03612c3e67da2211ddd)

Co-authored-by: RayXu <140802139+F18-Maverick@users.noreply.github.com>

diff --git a/Doc/c-api/code.rst b/Doc/c-api/code.rst
index f187cad4e63054e8cbb044f59a7323f36453d0fb..f38dd8060fcf605f2ce7ab886f82bd67e671caa5 100644 (file)
--- a/Doc/c-api/code.rst
+++ b/Doc/c-api/code.rst
@@ -285,7 +285,7 @@ may change without deprecation warnings.
 
 .. c:function:: Py_ssize_t PyUnstable_Eval_RequestCodeExtraIndex(freefunc free)
 
-   Return a new an opaque index value used to adding data to code objects.
+   Return a new opaque index value used to adding data to code objects.
 
    You generally call this function once (per interpreter) and use the result
    with ``PyCode_GetExtra`` and ``PyCode_SetExtra`` to manipulate