Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Fix typos in functest-docker.yml

    Change-Id: Ibca13382d10de5963929d528ac53e09bf76da6cd
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 5bf9ad7..975b774 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 5bf9ad7a7bfc260cf02531071a8af4b23f75bdf0
+Subproject commit 975b77404e0e01517007ca4658615cf97f2c94d1