Add 2.6 release note.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84934 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/docs/GettingStarted.html b/docs/GettingStarted.html
index 890d8f8..476ccf1 100644
--- a/docs/GettingStarted.html
+++ b/docs/GettingStarted.html
@@ -724,6 +724,7 @@
 subdirectories of the '<tt>tags</tt>' directory:</p>
 
 <ul>
+<li>Release 2.6: <b>RELEASE_26</b></li>
 <li>Release 2.5: <b>RELEASE_25</b></li>
 <li>Release 2.4: <b>RELEASE_24</b></li>
 <li>Release 2.3: <b>RELEASE_23</b></li>