Update git submodules

* Update docs/submodules/apex from branch 'stable/danube'
  - Updates docs for D2.0

    Change-Id: I9bdd3d6437b3a8b8c356beea4de1214de6f649b0
    Signed-off-by: Tim Rozet <trozet@redhat.com>

diff --git a/docs/submodules/apex b/docs/submodules/apex
index d358ad2..605342b 160000 (submodule)
--- a/docs/submodules/apex
+++ b/docs/submodules/apex
@@ -1 +1 @@
-Subproject commit d358ad2a8a0716aea05c0c509149663ac4fad9df
+Subproject commit 605342b46095341c9301456c81e354c73e2197eb