Update git submodules

* Update docs/submodules/fuel from branch 'stable/euphrates'
  - docs: Add network layout example diagrams

    JIRA: FUEL-295

    Change-Id: I3d7958951f1b37fe34dfaa28710a7f286a7a549a
    Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>
    (cherry picked from commit b6527d709db68ce2847f34a368316878b9c6ff75)

diff --git a/docs/submodules/fuel b/docs/submodules/fuel
index b434464..93ed07d 160000 (submodule)
--- a/docs/submodules/fuel
+++ b/docs/submodules/fuel
@@ -1 +1 @@
-Subproject commit b434464fee83f0edbb1b5204edc71998f9b7aa09
+Subproject commit 93ed07d69c2ca31e7c3da5cc674cacef13581bc7