Mention the 2.9 release.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/branches/release_29@128666 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/docs/GettingStarted.html b/docs/GettingStarted.html
index 3dd2e4a..9fa8a77 100644
--- a/docs/GettingStarted.html
+++ b/docs/GettingStarted.html
@@ -736,6 +736,7 @@
 subdirectories of the '<tt>tags</tt>' directory:</p>
 
 <ul>
+<li>Release 2.9: <b>RELEASE_29</b></li>
 <li>Release 2.8: <b>RELEASE_28</b></li>
 <li>Release 2.7: <b>RELEASE_27</b></li>
 <li>Release 2.6: <b>RELEASE_26</b></li>