[4.0] 7e80a5d Clarify comment

[Lasse Karstensen]

commit 7e80a5d920601cf3a1cb475f216b3770978eb4aa
Author: Federico G. Schwindt <fgsch at lodoss.net>
Date:   Tue Dec 16 14:30:30 2014 +0000

    Clarify comment

diff --git a/bin/varnishd/cache/cache_rfc2616.c b/bin/varnishd/cache/cache_rfc2616.c
index b0ebaf3..f03d32e 100644
--- a/bin/varnishd/cache/cache_rfc2616.c
+++ b/bin/varnishd/cache/cache_rfc2616.c
@@ -89,7 +89,7 @@ RFC2616_Ttl(struct busyobj *bo, double now)
 
 	/*
 	 * Initial cacheability determination per [RFC2616, 13.4]
-	 * We do not support ranges yet, so 206 is out.
+	 * We do not support ranges to the backend yet, so 206 is out.
 	 */
 
 	if (http_GetHdr(hp, H_Age, &p)) {