Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "clarify schema base on swagger1.2 specification"
  - clarify schema base on swagger1.2 specification

    Change-Id: I98e165ae943b54d6a38783f2a3822d381c247ee4
    Signed-off-by: SerenaFeng <feng.xiaowei@zte.com.cn>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index d094ccc..f6554da 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit d094ccc52e37fd57940fcee41cb038e3d4a51fc9
+Subproject commit f6554da7e6a13f6183f9b58901765f979381820b