Update git submodules

* Update docs/submodules/armband from branch 'master'
  - [docs] Fix broken link and label

    Change-Id: Ia19c1ed05c9d70729787c20650f9a964fc8ede77
    Signed-off-by: Cristina Pauna <cristina.pauna@enea.com>

diff --git a/docs/submodules/armband b/docs/submodules/armband
index 902dee3..02186a6 160000 (submodule)
--- a/docs/submodules/armband
+++ b/docs/submodules/armband
@@ -1 +1 @@
-Subproject commit 902dee384d627fda43b715fc6b47ecd97636c7b8
+Subproject commit 02186a64b206896f03f5ef8995319782b81d37db