[3.14] pythongh-137043: mention PyList_GET_ITEM as unsafe borrowed API in free-threading docs (pythonGH-137042) (python#137045)

Co-authored-by: Guido Imperiale <crusaderky@gmail.com>

Author: 2 people

Doc/howto/free-threading-extensions.rst

@@ -161,6 +161,8 @@ that return :term:`strong references <strong reference>`.
 +===================================+===================================+
 | :c:func:`PyList_GetItem`          | :c:func:`PyList_GetItemRef`       |
 +-----------------------------------+-----------------------------------+
+| :c:func:`PyList_GET_ITEM`         | :c:func:`PyList_GetItemRef`       |
++-----------------------------------+-----------------------------------+
 | :c:func:`PyDict_GetItem`          | :c:func:`PyDict_GetItemRef`       |
 +-----------------------------------+-----------------------------------+
 | :c:func:`PyDict_GetItemWithError` | :c:func:`PyDict_GetItemRef`       |