Update notes for submitted changes

* Add RefDatabase#getRefsByPrefix method

4f/aec31c0a9ff92efdac10d1bd5db1a929ce74a2

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+Verified+1: Jonathan Nieder <jrn@google.com>
+Verified+1: CI Bot
+Code-Review+1: Jonathan Tan <jonathantanmy@google.com>
+Code-Review+2: Jonathan Nieder <jrn@google.com>
+Submitted-by: Jonathan Nieder <jrn@google.com>
+Submitted-at: Fri, 20 Apr 2018 14:48:34 -0400
+Reviewed-on: https://git.eclipse.org/r/120873
+Project: jgit/jgit
+Branch: refs/heads/master