set a smaller line height for sidebox headers to avoid whitespace at the top

Change-Id: I8f1c4de275f3d7b2f55460bf4dc32a9a3d6b04ae
diff --git a/tools/droiddoc/templates-sdk/assets/css/default.css b/tools/droiddoc/templates-sdk/assets/css/default.css
index 69418df..7515360 100644
--- a/tools/droiddoc/templates-sdk/assets/css/default.css
+++ b/tools/droiddoc/templates-sdk/assets/css/default.css
@@ -1900,6 +1900,7 @@
 .sidebox h5 {
   font-weight:bold;
   margin:0 0 10px;
+  line-height: 16px;
 }
 
 .sidebox * {