[MINOR] update links in documentation page
diff --git a/_src/documentation.html b/_src/documentation.html
index e2f9328..4a96da7 100644
--- a/_src/documentation.html
+++ b/_src/documentation.html
@@ -38,12 +38,13 @@
<p>Documentation such as programming guides, reference guides, and API docs is available for SystemDS below:</p>
<a class="button button-primary" href="{{ site.data.project.docs }}">Latest</a>
<p></p>
- <a class="button button-primary" href="docs/2.1.0/index">2.1.0</a>
- <a class="button button-primary" href="release-notes/systemds-release-notes-2.1.0">ReleaseNotes</a>
+ <a class="button button-primary" href="docs/2.2.0/index">2.2.0</a>
+ <a class="button button-primary" href="release-notes/systemds-release-notes-2.2.0">ReleaseNotes</a>
</div>
<div class="col col-4">
<p>each released version of SystemML/DS:</p>
<ul>
+ <li><a href="docs/2.1.0/index">2.1.0</a>, <a href="release-notes/systemds-release-notes-2.1.0">ReleaseNotes</a></li>
<li><a href="docs/2.0.0/index">2.0.0</a>, <a href="release-notes/systemds-release-notes-2.0.0">ReleaseNotes</a></li>
<li><a href="docs/1.2.0/index">1.2.0</a>, <a href="release-notes/systemml-release-notes-1.2.0">ReleaseNotes</a></li>
<li><a href="docs/1.1.0/index">1.1.0</a>, <a href="release-notes/systemml-release-notes-1.1.0">ReleaseNotes</a></li>
