BUG 2041701: Release notes content/link in SDK Updater schema

tools/sdkmanager/libs/sdklib/tests/com/android/sdklib/repository/repository_sample.xml

@@ -39,6 +39,10 @@
         <sdk:uses-license ref="license1" />
         <sdk:description>Some optional description</sdk:description>
         <sdk:desc-url>http://www.example.com/platform1.html</sdk:desc-url>
+        <sdk:release-note>This is an optional release note
+            for this package. It's a free multi-line text.
+        </sdk:release-note>
+        <sdk:release-url>http://some/url/for/the/release/note.html</sdk:release-url>
         <!-- The archives node is mandatory and it cannot be empty. -->
         <sdk:archives>
             <sdk:archive os="any">