[master] 9f6dd411a 6.1 release notes reference SessError to diagnose sess_fail_other.

[Geoff Simmons]

commit 9f6dd411ae558868948a38e366d2df319c053f53
Author: Geoff Simmons <geoff at uplex.de>
Date:   Mon Sep 17 11:46:33 2018 +0200

    6.1 release notes reference SessError to diagnose sess_fail_other.

diff --git a/doc/sphinx/whats-new/upgrading-6.1.rst b/doc/sphinx/whats-new/upgrading-6.1.rst
index f6e53da1e..27d5e4acb 100644
--- a/doc/sphinx/whats-new/upgrading-6.1.rst
+++ b/doc/sphinx/whats-new/upgrading-6.1.rst
@@ -271,7 +271,7 @@ Other changes
 
     * ``sess_fail_other``: number of accept failures for reasons
       other than those given by the other ``sess_fail_*`` counters.
-      More details may appear in the ``Debug`` entry of the log
+      More details may appear in the ``SessError`` entry of the log
       (:ref:`varnish-counters(7)` shows a ``varnishlog`` invocation
       that may help).