Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Need to change directory check for new docs verify

    old dir is no longer generated
    grab dir created by tox -e docs

    Change-Id: If52e931f6abdc8dcb39fbe7aac3c6b3342ce81c8
    Signed-off-by: agardner <agardner@linuxfoundation.org>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 424a1a2..8f798e8 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 424a1a2ab9900cfe752d886fa617ae28f018c3e5
+Subproject commit 8f798e8a7e2526790e9377057efb030c70e19759