Update git submodules

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

    Change-Id: I2da89d7a6ab4b0549edded908acc760b949231e1
    Signed-off-by: Tim Rozet <trozet@redhat.com>

diff --git a/docs/submodules/apex b/docs/submodules/apex
index 37155cf..9478714 160000 (submodule)
--- a/docs/submodules/apex
+++ b/docs/submodules/apex
@@ -1 +1 @@
-Subproject commit 37155cf6521e7cf7cb2d61a269f3a9992fa0a6c0
+Subproject commit 94787144f6d92476854ca6f8ab65427beafea7a4