Update git submodules

* Update docs/submodules/nfvbench from branch 'stable/euphrates'
  - Corrected spelling mistake

    Change-Id: Iaf3f80ec3d96e1c157dd2b0c161f8c40b453df83
    Signed-off-by: Sofia Wallin <sofia.wallin@ericsson.com>

diff --git a/docs/submodules/nfvbench b/docs/submodules/nfvbench
index c73860d..393e059 160000 (submodule)
--- a/docs/submodules/nfvbench
+++ b/docs/submodules/nfvbench
@@ -1 +1 @@
-Subproject commit c73860d3d36b718359a680cf2abd971aad47bec2
+Subproject commit 393e05913cbe555457d7e63266240b3bf44d9a98