Update notes for submitted changes

* Remove double blank from sentence start
* Bump Bazel version to 3.0.0

38/51023e0841b84b33a1a5dc9371687dedf20437

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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: Fri, 17 Apr 2020 18:28:21 -0400
+Reviewed-on: https://git.eclipse.org/r/160567
+Project: jgit/jgit
+Branch: refs/heads/stable-5.6

a7/9c5b1f1046f4b41928bc40ab433155168dacc6

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+Code-Review+1: Michael Keppler <michael.keppler@gmx.de>
+Code-Review+1: David Ostrovsky <d.ostrovsky@gmx.de>
+Verified+1: Matthias Sohn <matthias.sohn@sap.com>
+Code-Review+2: Matthias Sohn <matthias.sohn@sap.com>
+Submitted-by: Matthias Sohn <matthias.sohn@sap.com>
+Submitted-at: Fri, 17 Apr 2020 18:28:21 -0400
+Reviewed-on: https://git.eclipse.org/r/161114
+Project: jgit/jgit
+Branch: refs/heads/stable-5.6