[master] 0183ed4 trivial comment fix

[Nils Goroll]

commit 0183ed45fe2e6115469fc4335327d26d313fc878
Author: Nils Goroll <nils.goroll at uplex.de>
Date:   Mon Apr 25 16:24:36 2016 +0200

    trivial comment fix

diff --git a/bin/varnishd/cache/cache_ban_build.c b/bin/varnishd/cache/cache_ban_build.c
index 8401707..4c1b64f 100644
--- a/bin/varnishd/cache/cache_ban_build.c
+++ b/bin/varnishd/cache/cache_ban_build.c
@@ -48,7 +48,7 @@ struct ban_proto {
 };
 
 /*--------------------------------------------------------------------
- * Variables we can purge on
+ * Variables we can ban on
  */
 
 static const struct pvar {