Update git submodules

* Update docs/submodules/apex from branch 'stable/euphrates'
  - Updates docs and scenarios for Euphrates

    Change-Id: I2da89d7a6ab4b0549edded908acc760b949231e1
    Signed-off-by: Tim Rozet <trozet@redhat.com>
    (cherry picked from commit 94787144f6d92476854ca6f8ab65427beafea7a4)

diff --git a/docs/submodules/apex b/docs/submodules/apex
index 6960788..e675928 160000 (submodule)
--- a/docs/submodules/apex
+++ b/docs/submodules/apex
@@ -1 +1 @@
-Subproject commit 6960788c4d5124a2ee4b31aa36408a050618d95c
+Subproject commit e675928d02d66928f291b83ef805b56a5fc41010