Update git submodules

* Update docs/submodules/releng-xci from branch 'master'
  - Create the structure for the documentation

    This change puts the initial structure for the documentation.

    Change-Id: I4ff075874815bfcd1834049ae205a02b72bae75f
    Signed-off-by: Fatih Degirmenci <fatih.degirmenci@ericsson.com>

diff --git a/docs/submodules/releng-xci b/docs/submodules/releng-xci
index cfd3a20..07d8817 160000 (submodule)
--- a/docs/submodules/releng-xci
+++ b/docs/submodules/releng-xci
@@ -1 +1 @@
-Subproject commit cfd3a2099c5687e23c80bfdee55127572a39edc9
+Subproject commit 07d88170fa827f9907a62d6bdbf3bc0c1ffc90ee