Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "Fix Yamllint violation for jjb/doctor"
  - Fix Yamllint violation for jjb/doctor

    JIRA: RELENG-254

    Change-Id: I8d9264a1bc69e5c2578886fa1a0112e19cf835b4
    Signed-off-by: Trevor Bramwell <tbramwell@linuxfoundation.org>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index b67f406..c20996e 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit b67f40692d5d353559cff6ba1636c5b0552ff06c
+Subproject commit c20996e168b7f09fabdd4f39295c81337525f6a5