Update git submodules

* Update docs/submodules/apex from branch 'master'
  - Merge "Adding yamllint to build checks"
  - Adding yamllint to build checks

    - making formatting changes to yaml files to meet yamllint checks

    Change-Id: Id48a8446512943e908e61dc00bbe6c033af27775
    Signed-off-by: Dan Radez <dradez@redhat.com>

diff --git a/docs/submodules/apex b/docs/submodules/apex
index 2f1a9dc..b411839 160000 (submodule)
--- a/docs/submodules/apex
+++ b/docs/submodules/apex
@@ -1 +1 @@
-Subproject commit 2f1a9dc491f55b5890a030a8ee36faa15de57b9e
+Subproject commit b411839804e6fca023ef7a695bbb616ea80fd6f3