merge 3.4 (#16395)

Author: benjaminp

Doc/c-api/sequence.rst

@@ -123,10 +123,10 @@ Sequence Protocol
 
 .. c:function:: PyObject* PySequence_Fast(PyObject *o, const char *m)
 
-   Returns the sequence *o* as a tuple, unless it is already a tuple or list, in
-   which case *o* is returned.  Use :c:func:`PySequence_Fast_GET_ITEM` to access the
-   members of the result.  Returns *NULL* on failure.  If the object is not a
-   sequence, raises :exc:`TypeError` with *m* as the message text.
+   Return the sequence *o* as a list, unless it is already a tuple or list, in
+   which case *o* is returned.  Use :c:func:`PySequence_Fast_GET_ITEM` to access
+   the members of the result.  Returns *NULL* on failure.  If the object is not
+   a sequence, raises :exc:`TypeError` with *m* as the message text.
 
 
 .. c:function:: PyObject* PySequence_Fast_GET_ITEM(PyObject *o, Py_ssize_t i)