Update git submodules

* Update docs/submodules/sfc from branch 'master'
  - Fix yamllint errors and warnings

    Change-Id: I33f3fd0aa0bc71a1ee07ea4504619b090517a87b
    Signed-off-by: Dimitrios Markou <mardim@intracom-telecom.com>

diff --git a/docs/submodules/sfc b/docs/submodules/sfc
index fa5e8b4..60f2b2c 160000 (submodule)
--- a/docs/submodules/sfc
+++ b/docs/submodules/sfc
@@ -1 +1 @@
-Subproject commit fa5e8b4d5a0f3fda560c6667e944bfb989c73fb4
+Subproject commit 60f2b2cf578fbf2a9e0efba4709d4aa6aa8a2f79