Update notes for submitted changes

* Clarify the semantics of DfsRefDatabase#compareAndPut

12/27165e27c589a5002840b5fd88f0bfc8a6433b

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+Code-Review+2: Shawn Pearce <spearce@spearce.org>
+Verified+1: Hudson CI
+Submitted-by: Shawn Pearce <spearce@spearce.org>
+Submitted-at: Thu, 25 Aug 2016 22:29:46 -0400
+Reviewed-on: https://git.eclipse.org/r/77433
+Project: jgit/jgit
+Branch: refs/heads/master