Update git submodules

* Update docs/submodules/fuel from branch 'stable/euphrates'
  - Fix or silence all yamllint warnings

    Change-Id: Iface28ab770beee00374afb902ef4f9c983538f5
    Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>
    (cherry picked from commit 597e4b55f57001ead8e90f30e2e3211c7d705ca8)

diff --git a/docs/submodules/fuel b/docs/submodules/fuel
index 91a3426..53282e1 160000 (submodule)
--- a/docs/submodules/fuel
+++ b/docs/submodules/fuel
@@ -1 +1 @@
-Subproject commit 91a3426ee125951d54d7e80ee8c133168221fcba
+Subproject commit 53282e13c6c3937f5a3b9e91e72104252a38762f