add unstable YARN installer, fix Preston's name
diff --git a/community.html b/community.html
index e28b614..13b9140 100644
--- a/community.html
+++ b/community.html
@@ -256,7 +256,7 @@
     </tr>
     <tr>
       <td><img src="https://asterixdb.incubator.apache.org//img/team/anonymous.jpg" width="100" height="100" /></td>
-      <td>Preson Carman</td>
+      <td>Preston Carman</td>
       <td>UC Riverside</td>
       <td>prestonc</td>
     </tr>