[master] 840f5cf spelling

[Per Buer]

commit 840f5cf7cc84115946b8268fe7de98fd106ea51a
Author: Per Buer <perbu at varnish-software.com>
Date:   Thu Feb 20 19:39:35 2014 +0100

    spelling

diff --git a/doc/sphinx/users-guide/params.rst b/doc/sphinx/users-guide/params.rst
index d3a10af..a283d51 100644
--- a/doc/sphinx/users-guide/params.rst
+++ b/doc/sphinx/users-guide/params.rst
@@ -3,7 +3,7 @@
 Parameters
 ----------
 
-Varnish Cache has a set of parameter that affect its behaviour and
+Varnish Cache has a set of parameters that affect its behaviour and
 performance. Most of these parameters can be set on the Varnish
 command line (through varnishadm) using the param.set keyword.