fix doubled words

jbafford · jbafford · commit 0fb6de3ca253 · 2013-05-23T11:23:48.000-07:00
diff --git a/book/http_cache.rst b/book/http_cache.rst
@@ -975,7 +975,7 @@ possible.
 
 .. tip::
 
-    The listener listener only responds to local IP addresses or trusted
+    The listener only responds to local IP addresses or trusted
     proxies.
 
 .. note::
