Update nav.web.template.html

Author: REAS

java_generate/templates/nav.web.template.html

@@ -13,7 +13,7 @@
 
 	<a href="/tutorials/">Tutorials</a><br />
 	<a href="/examples/">Examples</a><br />
-	<a href="/books/">Books</a><br />
+	<a href="/books/">Books</a><br /><br />
     <!--<a href="/handbook/">Handbook</a><br /><br />-->
 
 	<a href="/overview/">Overview</a><br />