Update git submodules

* Update docs/submodules/fuel from branch 'master'
  - fix for documentation: correct git checkout tag is opnfv-5.0.2

    Change-Id: I2c4192d4dc299d167ba6b1b9db91c6d73c87c417
    Signed-off-by: Mika Rautakumpu <mika.rautakumpu@nokia.com>

diff --git a/docs/submodules/fuel b/docs/submodules/fuel
index 4b16365..6cb5e8e 160000 (submodule)
--- a/docs/submodules/fuel
+++ b/docs/submodules/fuel
@@ -1 +1 @@
-Subproject commit 4b163654de5efd0f4ad5dc5c88475f6fa2b4b8ae
+Subproject commit 6cb5e8ee2deeda4b08cefe8925078410994d084f