Update git submodules

* Update docs/submodules/fuel from branch 'stable/fraser'
  - [docs] Updates for the first Fraser release

    Change-Id: I80dfb55c01af89bded1140cd27563d258e05dda4
    Signed-off-by: Cristina Pauna <cristina.pauna@enea.com>
    (cherry picked from commit b67b07e5654dbe0c7524e47ebb97eed987edf3d6)

diff --git a/docs/submodules/fuel b/docs/submodules/fuel
index 285d474..3ccce92 160000 (submodule)
--- a/docs/submodules/fuel
+++ b/docs/submodules/fuel
@@ -1 +1 @@
-Subproject commit 285d4744660e6c44c381c260f78550b563a7e012
+Subproject commit 3ccce927c34273acfc8045f48591d05414669bd4