Make _PyUnicode_FromId return borrowed references.
http://mail.python.org/pipermail/python-dev/2011-November/114347.html
diff --git a/Include/unicodeobject.h b/Include/unicodeobject.h
index 58c1f55..c445ad6 100644
--- a/Include/unicodeobject.h
+++ b/Include/unicodeobject.h
@@ -2024,7 +2024,7 @@
    shutdown, all strings are released (through _PyUnicode_ClearStaticStrings).
 
    Alternatively, _Py_static_string allows to choose the variable name.
-   _PyUnicode_FromId returns a new reference to the interned string.
+   _PyUnicode_FromId returns a borrowed reference to the interned string.
    _PyObject_{Get,Set,Has}AttrId are __getattr__ versions using _Py_Identifier*.
 */
 typedef struct _Py_Identifier {