Add ..versionadded for sys.int_info, update py3k version of
whatsnew/2.7.rst to keep it in sync with the trunk version, and
replace SHIFT with PyLong_SHIFT in #error message
diff --git a/Doc/library/sys.rst b/Doc/library/sys.rst
index 091b4d6..632e550 100644
--- a/Doc/library/sys.rst
+++ b/Doc/library/sys.rst
@@ -429,6 +429,8 @@
    |                         | represent a digit                            |
    +-------------------------+----------------------------------------------+
 
+   .. versionadded:: 3.1
+
 
 .. function:: intern(string)