Update notes for submitted changes

* SubmoduleWalk#forPath: Clarify that caller must close returned instance
* ConfigConstants: Fix quoting of section names in javadocs
* Upgrade maven-pmd-plugin to 3.12.0

18/ae69158fd0dee96422d68331377a217e9dab71

@@ -0,0 +1,7 @@
+Code-Review+2: Matthias Sohn <matthias.sohn@sap.com>
+Verified+1: David Pursehouse <david.pursehouse@gmail.com>
+Submitted-by: David Pursehouse <david.pursehouse@gmail.com>
+Submitted-at: Sun, 28 Apr 2019 20:45:48 -0400
+Reviewed-on: https://git.eclipse.org/r/140460
+Project: jgit/jgit
+Branch: refs/heads/master

84/04757062a88ed92bef89292d981323364367a1

@@ -0,0 +1,7 @@
+Code-Review+2: Matthias Sohn <matthias.sohn@sap.com>
+Verified+1: David Pursehouse <david.pursehouse@gmail.com>
+Submitted-by: David Pursehouse <david.pursehouse@gmail.com>
+Submitted-at: Sun, 28 Apr 2019 20:45:48 -0400
+Reviewed-on: https://git.eclipse.org/r/140936
+Project: jgit/jgit
+Branch: refs/heads/master

84/91a1134e10a1da183630d0f6469d55fb466b00

@@ -0,0 +1,8 @@
+Code-Review+1: Carsten Hammer <carsten.hammer@t-online.de>
+Code-Review+2: Matthias Sohn <matthias.sohn@sap.com>
+Verified+1: David Pursehouse <david.pursehouse@gmail.com>
+Submitted-by: David Pursehouse <david.pursehouse@gmail.com>
+Submitted-at: Sun, 28 Apr 2019 20:45:48 -0400
+Reviewed-on: https://git.eclipse.org/r/140573
+Project: jgit/jgit
+Branch: refs/heads/master