Mention the --enable-targets= option to configure.

llvm-svn: 21459
diff --git a/llvm/docs/ReleaseNotes.html b/llvm/docs/ReleaseNotes.html
index e3ae389..4bcf6c4 100644
--- a/llvm/docs/ReleaseNotes.html
+++ b/llvm/docs/ReleaseNotes.html
@@ -84,6 +84,9 @@
       Alpha, and IA64.</li>
   <li>Support for Microsoft Visual Studio is improved, and <a 
       href="GettingStartedVS.html">now documented</a>.</li>
+  <li>Configuring LLVM to build targets selectively is now implemented, via the
+      <tt>--enable-targets=</tt> option. This feature is documented
+      <a href="GettingStarted.html#config">here</a>.</li>
 </ol>
 
 </div>