Update git submodules

* Update docs/submodules/releng-xci from branch 'master'
  - Add section describing how to get involved

    Change-Id: I9c552930b46dad2bf9720595d44208b393dba643
    Signed-off-by: Fatih Degirmenci <fdegir@gmail.com>

diff --git a/docs/submodules/releng-xci b/docs/submodules/releng-xci
index b1f8a1b..be8c241 160000 (submodule)
--- a/docs/submodules/releng-xci
+++ b/docs/submodules/releng-xci
@@ -1 +1 @@
-Subproject commit b1f8a1b75764937befd84cb00138c61c893eec82
+Subproject commit be8c241017a04c280ab8fd92b4e528bb05725468