Update notes for submitted changes

* Add better documentation to DirCacheCheckout

1c/4ee41dc093266c19d4452879afe5c0f7f387f4

@@ -0,0 +1,9 @@
+Code-Review+2: Matthias Sohn <matthias.sohn@sap.com>
+IP-Clean+1: Matthias Sohn <matthias.sohn@sap.com>
+Code-Review+1: Christian Halstrick <christian.halstrick@sap.com>
+Verified+1: Hudson CI
+Submitted-by: Matthias Sohn <matthias.sohn@sap.com>
+Submitted-at: Wed, 06 Feb 2013 18:22:59 -0500
+Reviewed-on: https://git.eclipse.org/r/10228
+Project: jgit/jgit
+Branch: refs/heads/stable-2.3