Update git submodules

* Update docs/submodules/armband from branch 'master'
  - u/fuel: Bump & rebase for doc updates

    While at it, backport proposed upstream PR [1] fixing MaaS curtin
    arm64 template's missing newline.

    [1] https://github.com/salt-formulas/salt-formula-maas/pull/31

    Change-Id: Ibad424ea52197fd3b289a722b23bd6c6ba354f72
    Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>

diff --git a/docs/submodules/armband b/docs/submodules/armband
index f7b4157..e3f3f48 160000 (submodule)
--- a/docs/submodules/armband
+++ b/docs/submodules/armband
@@ -1 +1 @@
-Subproject commit f7b415771ffd76ee1100b6b056942ba8db754b1d
+Subproject commit e3f3f481e55c0c07b6fdb36214889e8edb52bf39