Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "update Readme.rst to be consistent with current implementation"
  - update Readme.rst to be consistent with current implementation

    Change-Id: Ie8abeca5901cce635f54f0c01496a7181287d0cd
    Signed-off-by: SerenaFeng <feng.xiaowei@zte.com.cn>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index d32f1a2..4ef7b78 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit d32f1a2fb39d8fcca1fe58e0ac3c8b2883eee986
+Subproject commit 4ef7b78012e3665299cb933448f208783adf6031