added hint to gsa response writer that the result comes from a yacy peer

source/net/yacy/cora/federate/solr/responsewriter/GSAResponseWriter.java

@@ -76,7 +76,7 @@ public class GSAResponseWriter implements QueryResponseWriter {
 
 
     private static final char[] XML_START = (
-                    "<?xml version=\"1.0\" encoding=\"UTF-8\" standalone=\"no\"?>\n<GSP VER=\"3.2\">\n<!-- This is a Google Search Appliance API, see https://developers.google.com/search-appliance/documentation/68/xml_reference -->\n").toCharArray();
+                    "<?xml version=\"1.0\" encoding=\"UTF-8\" standalone=\"no\"?>\n<GSP VER=\"3.2\">\n<!-- This is a Google Search Appliance API result, provided by YaCy. See https://developers.google.com/search-appliance/documentation/68/xml_reference -->\n").toCharArray();
     private static final char[] XML_STOP = "</GSP>\n".toCharArray();
 
     // define a list of simple YaCySchema -> RSS Token matchings