Update git submodules

* Update docs/submodules/fuel from branch 'master'
  - [submodule] Bump Pharos

    Change-Id: Ib5f7a9d7874704b11b10cdc1eefaae19de2a629e
    Signed-off-by: Cristina Pauna <cristina.pauna@enea.com>

diff --git a/docs/submodules/fuel b/docs/submodules/fuel
index 0a8568d..ef46d8a 160000 (submodule)
--- a/docs/submodules/fuel
+++ b/docs/submodules/fuel
@@ -1 +1 @@
-Subproject commit 0a8568d9f170d6c3b42d2dd35db440b4251f9a5d
+Subproject commit ef46d8af46c861bdff5ba835bd89b97b334ea45c