Update git submodules

* Update docs/submodules/releng from branch 'master'
  - [opnfvdocs] verify: Relax changed files pattern

    Some changes alter the docs yet still don't trigger the verify job
    due to the pattern being too restrictive.

    Change-Id: I775bfdce5e31a4334d21da10ff3072268b2b6155
    Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 87540f4..76d6b19 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 87540f44393578cafb1b01764440f29802a4c47c
+Subproject commit 76d6b19a8ef7cefc948dceda3913413c5de4239d