add a "link" to existing release notes so we could find it better

ReleaseInstructions

@@ -160,7 +160,7 @@ Note: This document was adapted from the one created in the context of
 13. Upload the maven artifacts located under java-repository/org/apache/ant
     these artifacts comprise currently for each ant jar of one POM
     file, the corresponding jar file and the corresponding GPG
-    signatures (x.pom, x.jar, x.pom.asc, x.jar.asc) MD5 and SHA1 are
+    signatures (x.pom, x.jar, x.pom.asc, x.jar.asc) SHA1 are
     generated by ivy during the upload
 
     to