Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Fix a typo in docstring

    Change-Id: Ie03004474658bd3317a9be8a6b00f5bda1133f2c
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/functest b/docs/submodules/functest
index a28e2b4..3f6e594 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit a28e2b40877f022f6cc8bbc3ad9b586ef3dd126c
+Subproject commit 3f6e594c59b3a9dfcae502349e1c592ee9072f43