Update git submodules

* Update docs/submodules/fuel from branch 'master'
  - patches/scripts: Fix whitespace in context

    git option '--ignore-whitespace' has issues, at least on certain
    versions of git, like 2.7.4.
    Work around it by adding the trailing whitespace we previously
    removed in patch context lines.

    Change-Id: Id192a87ec92c798fa808bb8ef38384160ee3faf5
    Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>

diff --git a/docs/submodules/fuel b/docs/submodules/fuel
index 978fd9d..06c6694 160000 (submodule)
--- a/docs/submodules/fuel
+++ b/docs/submodules/fuel
@@ -1 +1 @@
-Subproject commit 978fd9da91b6cdd522e79a4b8c31cf8f800222a3
+Subproject commit 06c66940cad08ae875bba5791822e8895468780b