Update git submodules

* Update docs/submodules/releng-xci from branch 'master'
  - Merge "Docs transition"
  - Docs transition

    Changes are made by following
        https://docs.opnfv.org/en/latest/how-to-use-docs/local-build-transition.html

    Change-Id: If0ee2031894d4dbd54098548640b8cc71481e49f
    Signed-off-by: Fatih Degirmenci <fdegir@gmail.com>
    Signed-off-by: Trevor Bramwell <tbramwell@linuxfoundation.org>

diff --git a/docs/submodules/releng-xci b/docs/submodules/releng-xci
index da13cd2..f5968f2 160000 (submodule)
--- a/docs/submodules/releng-xci
+++ b/docs/submodules/releng-xci
@@ -1 +1 @@
-Subproject commit da13cd230fb877bbaa3037116f01e774d44c4b31
+Subproject commit f5968f2ad1fe036bfca986ceb8987f7142bc72f8