Update git submodules

* Update docs/submodules/apex from branch 'stable/euphrates'
  - Merge "Fixes clone fork change URL" into stable/euphrates
  - Fixes clone fork change URL

    Downloading the change information was failing for branches other than
    master.  This fixes the URL format to work for branches.

    Change-Id: I5ec0494aca93437266237ee63b292a6aa5a43f0e
    Signed-off-by: Tim Rozet <trozet@redhat.com>

diff --git a/docs/submodules/apex b/docs/submodules/apex
index 7e06254..e55f718 160000 (submodule)
--- a/docs/submodules/apex
+++ b/docs/submodules/apex
@@ -1 +1 @@
-Subproject commit 7e062540b6865c0751d6e982b496acc0bbc8b6b7
+Subproject commit e55f718f8a4450ab3efd89c9cb0ad9fabfc3ab90