Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "Add docs build jobs for stor4nfv"
  - Add docs build jobs for stor4nfv

    Change-Id: I432061b472c22dfd65821f8aeaf9c0c5671f3759
    Signed-off-by: Sofia Wallin <sofia.wallin@ericsson.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 2ac6d92..48eb2b0 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 2ac6d92e3e7aa87ad3eaa0eca9c2cc78466753c5
+Subproject commit 48eb2b0423d31ede4643d8888fc31a02e1120e9c