Update git submodules

* Update docs/submodules/nfvbench from branch 'master'
  - 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 663f83c..bd2c88b 160000 (submodule)
--- a/docs/submodules/nfvbench
+++ b/docs/submodules/nfvbench
@@ -1 +1 @@
-Subproject commit 663f83cf4430c0970fe69ac1d4b2149d3a77a35b
+Subproject commit bd2c88b1fe7a0f8c3883c9f60ff2cda88f8c33a1