Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Update Pharos PTL in Email PTL Macro

    Julien has recently been promoted to PTL of the Pharos project and the
    macro for emailing the Pharos PTL should reflect this change.

    Change-Id: Id3f025cd87284d480da892fc999d7379af50ac95
    Signed-off-by: Trevor Bramwell <tbramwell@linuxfoundation.org>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 9a461b0..e16e393 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 9a461b094d85abe28db973fcbe26b5c9ce495e0b
+Subproject commit e16e3939dcf8cc21323106a17ce4d0aec7d3b0e2