Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "Update Dovetail PTL Email Macro"
  - Update Dovetail PTL Email Macro

    Let the 'email-dovetail-ptl' macro reflect that Georg Kunz is the new
    PTL of the dovetail project.

    Change-Id: I3b3bd53a7c7f146105a719727fd627bf15054aca
    Signed-off-by: Trevor Bramwell <tbramwell@linuxfoundation.org>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 25ef72f..11e4d1f 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 25ef72f13b1a25c4d87bd5701616527c58e89f8d
+Subproject commit 11e4d1f751f7e708104528562260a6f3d3d6c9fd