[4.0] 728620a Unit has changed as well

[Lasse Karstensen]

commit 728620a0265c71681948391207d74e83ec895408
Author: Federico G. Schwindt <fgsch at lodoss.net>
Date:   Tue Nov 4 16:03:05 2014 +0000

    Unit has changed as well

diff --git a/doc/sphinx/whats-new/upgrading.rst b/doc/sphinx/whats-new/upgrading.rst
index cb36b08..e4dc5d5 100644
--- a/doc/sphinx/whats-new/upgrading.rst
+++ b/doc/sphinx/whats-new/upgrading.rst
@@ -198,7 +198,8 @@ Changes to existing parameters
 
 session_linger
 ~~~~~~~~~~~~~~
-`session_linger` has been renamed to `timeout_linger`.
+`session_linger` has been renamed to `timeout_linger` and it is in
+seconds now (previously was milliseconds).
 
 sess_timeout
 ~~~~~~~~~~~~