fix broken tag


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@145590 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/docs/ReleaseNotes.html b/docs/ReleaseNotes.html
index cc1414b..7b39bf0 100644
--- a/docs/ReleaseNotes.html
+++ b/docs/ReleaseNotes.html
@@ -176,7 +176,7 @@
       option to use if you want ultimate performance! It is still experimental
       though: it may cause the plugin to crash.  Setting the optimization level
       to <tt>-O4</tt> when using this option will optimize even harder, though
-      this usually doesn't result in any improvement over <tt>-O3<tt>.</li>
+      this usually doesn't result in any improvement over <tt>-O3</tt>.</li>
 
   <li>The type and constant conversion logic has been almost entirely rewritten,
       fixing a multitude of obscure bugs.</li>