Update git submodules

* Update docs/submodules/fuel from branch 'master'
  - MaaS: Fix conflicting curtin network config

    JIRA: FUEL-301

    Change-Id: I9de98fb961fd1d480b45a774de61ad6a93e9addf
    Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>

diff --git a/docs/submodules/fuel b/docs/submodules/fuel
index b1ea72b..3803f9f 160000 (submodule)
--- a/docs/submodules/fuel
+++ b/docs/submodules/fuel
@@ -1 +1 @@
-Subproject commit b1ea72ba2c441a59327cc931b95bb7ece41591d0
+Subproject commit 3803f9ff798b5c186e605cb8366b5153ab4e19fc