Blanch the 404 error message for those with no sense of humor

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@144314 65c4cc65-6c06-0410-ace0-fbb531ad65f3

res/res_phoneprov.c

@@ -526,7 +526,7 @@ out404:
 	*status = 404;
 	*title = strdup("Not Found");
 	*contentlength = 0;
-	return ast_http_error(404, "Not Found", NULL, "Nothing to see here.  Move along.");
+	return ast_http_error(404, "Not Found", NULL, "The requested URL was not found on this server.");
 
 out500:
 	route = unref_route(route);