Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Fix a typo which runs all jobs in parallel

    Change-Id: I454ff72c377a96aa769919348b27813ad434eb89
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 39291cb..91ad0c2 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 39291cb28712046f1c4e0ac107a67b582f3fa664
+Subproject commit 91ad0c2a13d809efd36420e24d3db8854630d537