Indent nested terms.

Change-Id: I1138585e94bff2a9509a75fedba1b1cc5ebdf300
diff --git a/handbook/resources/handbook.css b/handbook/resources/handbook.css
index 75bb77c..43e7739 100644
--- a/handbook/resources/handbook.css
+++ b/handbook/resources/handbook.css
@@ -22,6 +22,10 @@
 	margin-left: 2em;
 }
 
+dd div.dlist {
+	margin-left: 2em;
+}
+
 #toc { border-bottom: 0 solid #dddddd; padding-bottom: 0.5em; }
 #toc > ul { margin-left: 0.13333em; }
 #toc ul.sectlevel0 > li > a { font-style: italic; }