[master] 780cc21b2 release docs: point to the log for .fail_other

[Nils Goroll]

commit 780cc21b2005551501a89b49fb1dac69070b5873
Author: Nils Goroll <nils.goroll at uplex.de>
Date:   Tue Sep 11 09:16:35 2018 +0200

    release docs: point to the log for .fail_other

diff --git a/doc/sphinx/whats-new/upgrading-6.1.rst b/doc/sphinx/whats-new/upgrading-6.1.rst
index 3c635643f..3606951fb 100644
--- a/doc/sphinx/whats-new/upgrading-6.1.rst
+++ b/doc/sphinx/whats-new/upgrading-6.1.rst
@@ -246,7 +246,9 @@ Other changes
 
     * ``.fail_other``: number of connections to the backend that
       failed for reasons other than those given by the other
-      ``.fail_*`` counters.
+      ``.fail_*`` counters. For such cases, details on the failure
+      can be extracted from the varnish log as described above for
+      ``FetchError``.
 
     * ``.helddown``: the number of connections not attempted because
       the backend was in the period set by one of the parameters