docs: revise message when api level for docs is too low;
make the message appear on package pages as well

Change-Id: I9e71d4054e2e14efe9646029ac0a18022ec24fb2
diff --git a/tools/droiddoc/templates-sdk/package.cs b/tools/droiddoc/templates-sdk/package.cs
index e246e31..ea676b9 100644
--- a/tools/droiddoc/templates-sdk/package.cs
+++ b/tools/droiddoc/templates-sdk/package.cs
@@ -8,7 +8,7 @@
   elif:design ?>design<?cs
   elif:distribute ?>distribute<?cs
   /if ?>">
-  <div id="doc-api-level" class="<?cs var:class.since ?>" style="display:none"></div>
+  <div id="doc-api-level" class="<?cs var:package.since ?>" style="display:none"></div>
   <a name="top"></a>
 <?cs include:"header.cs" ?>