Update git submodules

* Update docs/submodules/fuel from branch 'stable/euphrates'
  - Merge "docs: Add more info about virtual deployment" into stable/euphrates
  - docs: Add more info about virtual deployment

    Change-Id: I82f639f380092ea6800ed1e7c86a415b7979ec44
    Signed-off-by: Taseer Ahmed <taseer94@gmail.com>
    (cherry picked from commit e942d5b7b4d73f2030840c08cb2943f7599eb557)

diff --git a/docs/submodules/fuel b/docs/submodules/fuel
index 1e1c8d4..b6e65db 160000 (submodule)
--- a/docs/submodules/fuel
+++ b/docs/submodules/fuel
@@ -1 +1 @@
-Subproject commit 1e1c8d421a2fa3fd28cf4201b17866ff057c84f2
+Subproject commit b6e65dbb9952aeafeff6fcc07b6dcd97940d62ff