8179557: Update generated Javadoc footer documentation link

Reviewed-by: erikj
diff --git a/make/Javadoc.gmk b/make/Javadoc.gmk
index 0c36b7c..f98cdab 100644
--- a/make/Javadoc.gmk
+++ b/make/Javadoc.gmk
@@ -52,7 +52,7 @@
 DOCROOTPARENT_FLAG ?= TRUE
 
 # URLs
-JAVADOC_BASE_URL := http://docs.oracle.com/javase/$(VERSION_SPECIFICATION)/docs
+JAVADOC_BASE_URL := http://www.oracle.com/pls/topic/lookup?ctx=javase9&id=homepage
 BUG_SUBMIT_URL := http://bugreport.java.com/bugreport/
 COPYRIGHT_URL := {@docroot}/../legal/cpyr.html