[4.1] a1c98ae Improve description.

[Lasse Karstensen]

commit a1c98ae382078b0910462dc5576e547027f024bf
Author: Lasse Karstensen <lkarsten at varnish-software.com>
Date:   Mon Sep 14 14:21:20 2015 +0200

    Improve description.

diff --git a/varnish.service b/varnish.service
index 717c9fc..afc16f0 100644
--- a/varnish.service
+++ b/varnish.service
@@ -1,5 +1,5 @@
 [Unit]
-Description=Varnish Cache HTTP accelerator
+Description=Varnish Cache, a high-performance HTTP accelerator
 
 [Service]
 Type=forking