[4.0] eafac81 call the orphans orphans

[Per Buer]

commit eafac811e45e916ae168e200140b9d853bbdb689
Author: Per Buer <perbu at varnish-software.com>
Date:   Fri Feb 21 21:05:59 2014 +0100

    call the orphans orphans

diff --git a/doc/sphinx/users-guide/index.rst b/doc/sphinx/users-guide/index.rst
index ced7723..efe6d25 100644
--- a/doc/sphinx/users-guide/index.rst
+++ b/doc/sphinx/users-guide/index.rst
@@ -45,7 +45,7 @@ Detailed Table of Contents:
    report
    performance
    troubleshooting
-   operation
+   orphans
 
 .. customizing (which is a non ideal title)