Update git submodules

* Update docs/submodules/apex from branch 'master'
  - More updates to docs for Euphrates

    Changes Include:
     - SFC HA will not be supported in 5.0
     - Table of Contents removed from release-notes/scenarios
     - Version table removed
     - Release date updated

    Change-Id: Ifbd766b578717320ba1924678839c7d48bbce041
    Signed-off-by: Tim Rozet <trozet@redhat.com>

diff --git a/docs/submodules/apex b/docs/submodules/apex
index 9478714..550c8c7 160000 (submodule)
--- a/docs/submodules/apex
+++ b/docs/submodules/apex
@@ -1 +1 @@
-Subproject commit 94787144f6d92476854ca6f8ab65427beafea7a4
+Subproject commit 550c8c756b04af4e4038e42ea17478e851b2341d