Docs: Space out nested lists correctly

Change-Id: I27dd7c492cc7aa8f1f3e253aebfe4c1e230b25ce
Reviewed-by: Leena Miettinen <riitta-leena.miettinen@nokia.com>
Reviewed-by: Virva Auvinen <virva.auvinen@nokia.com>

doc/templates/style/offline.css

@@ -448,6 +448,9 @@ ul{
 padding-bottom:2px;
 }
 
+li ul {
+padding-top: 10px;
+}
 li {
 margin-bottom: 10px;
 padding-left: 8px;