Update notes for submitted changes

* LockFile: create OutputStream only when needed

00/386272264f65c41e36406f7c2e9ea6e901276e

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+Verified+1: JGit Bot <jgit-bot@eclipse.org>
+Code-Review+1: David Ostrovsky <d.ostrovsky@gmx.de>
+Code-Review+2: Matthias Sohn <matthias.sohn@sap.com>
+Submitted-by: Matthias Sohn <matthias.sohn@sap.com>
+Submitted-at: Tue, 11 May 2021 04:15:21 -0400
+Reviewed-on: https://git.eclipse.org/r/c/jgit/jgit/+/180432
+Project: jgit/jgit
+Branch: refs/heads/stable-5.6