Update git submodules

* Update docs/submodules/fuel from branch 'master'
  - docs: Spelling correction

    Change-Id: I35076b8cd81451482944d91f3dd3337dd849ef28
    Signed-off-by: Taseer Ahmed <taseer94@gmail.com>

diff --git a/docs/submodules/fuel b/docs/submodules/fuel
index a1a7308..4c0e418 160000 (submodule)
--- a/docs/submodules/fuel
+++ b/docs/submodules/fuel
@@ -1 +1 @@
-Subproject commit a1a73087d8e5cb43d2ebcf313f7a784b20bc4a3e
+Subproject commit 4c0e4186721a2315ac316f5170c6cd3a8199eb6a