Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "Updating the license with Creative Commons Attribution 4.0 with SPDX shorthand"
  - Updating the license with Creative Commons Attribution 4.0 with SPDX shorthand

    Change-Id: Iff8ada7637648a320fc7ef4a0fb3e187186964e5
    Signed-off-by: Ray Paik <rpaik@linuxfoundation.org>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 6a2b8d4..5d01c51 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 6a2b8d4f1ddd0a2b1a11c9b51518e6ea56330774
+Subproject commit 5d01c51761046652be7a2eababf96a3de93ca6df