Update git submodules

* Update docs/submodules/armband from branch 'master'
  - Minor corrections and updates to docs

    Change-Id: I22ae7de7f13b6347b164c318a93aae4fa2209271
    Signed-off-by: Cristina Pauna <cristina.pauna@enea.com>

diff --git a/docs/submodules/armband b/docs/submodules/armband
index c46a388..24d88c3 160000 (submodule)
--- a/docs/submodules/armband
+++ b/docs/submodules/armband
@@ -1 +1 @@
-Subproject commit c46a38801e1ac8e62b029c4aa229237fd3534ec0
+Subproject commit 24d88c320689b6366d00e351dc704d874ee76dc7