Update git submodules

* Update docs/submodules/fuel from branch 'master'
  - Merge "Add tutorial for reclass-doc tool in documentation"
  - Add tutorial for reclass-doc tool in documentation

    JIRA: FUEL-293

    Change-Id: I2612e8d63875dca4d05f8c30db24a5ae84cc8dea
    Signed-off-by: Charalampos Kominos <Charalampos.Kominos@enea.com>
    Signed-off-by: Cristina Pauna <cristina.pauna@enea.com>

diff --git a/docs/submodules/fuel b/docs/submodules/fuel
index ef1c113..d994440 160000 (submodule)
--- a/docs/submodules/fuel
+++ b/docs/submodules/fuel
@@ -1 +1 @@
-Subproject commit ef1c1131020e45bd280f2ef158f5416552f190e0
+Subproject commit d994440a4299e338f4651030f2d41d7e86f9c06b