Update git submodules

* Update docs/submodules/armband from branch 'stable/euphrates'
  - u/fuel: Bump & rebase for yamllint cleanup

    Change-Id: I1144c523596feb64251f08375501cdb73a0d76f6
    Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>
    (cherry picked from commit 6dcb09998dae3c3f2a55fc5169fe7dc9010f8a0f)

diff --git a/docs/submodules/armband b/docs/submodules/armband
index aff2252..763cf5a 160000 (submodule)
--- a/docs/submodules/armband
+++ b/docs/submodules/armband
@@ -1 +1 @@
-Subproject commit aff2252078c012c49e713f4dc025e7d911c944a0
+Subproject commit 763cf5a07027d8c26b597a40051fd9af8fbe3f81