Update git submodules

* Update docs/submodules/apex from branch 'stable/danube'
  - Merge "Updates release notes for Danube" into stable/danube
  - Updates release notes for Danube

    Change-Id: Id3a90d1ba53502bc28db3e04d2795e9806f42eed
    Signed-off-by: Tim Rozet <trozet@redhat.com>
    (cherry picked from commit 9881eac1a9b1cc32ba7239e3d9189df3c11784ac)

diff --git a/docs/submodules/apex b/docs/submodules/apex
index bc28dc2..6e95a5a 160000 (submodule)
--- a/docs/submodules/apex
+++ b/docs/submodules/apex
@@ -1 +1 @@
-Subproject commit bc28dc258e2852d68a8b16f31903b80d4d6c8e27
+Subproject commit 6e95a5aa856d61f85543ed8e0f654ef90afb953e