Update git submodules

* Update docs/submodules/armband from branch 'stable/euphrates'
  - u/fuel: Bump & rebase for PDF-based network config

    Change-Id: If970bbc8735d38542a90b2cbdbb2523ae644a29c
    Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>
    (cherry picked from commit 7bcfc857535346a72708b1166759e8480e676a38)

diff --git a/docs/submodules/armband b/docs/submodules/armband
index e459998..9ab869c 160000 (submodule)
--- a/docs/submodules/armband
+++ b/docs/submodules/armband
@@ -1 +1 @@
-Subproject commit e459998934a11ddafb62a0b011448b1bf295f370
+Subproject commit 9ab869c0eb50fde3d8ccdf20bdd86c68995f59db