Update git submodules

* Update docs/submodules/sfc from branch 'stable/danube'
  - Release notes update

    Release notes updated
    Waiting for the official documents to be created to change the links (e.g.
    user guide, installation guide...)

    Change-Id: If6569585aaa6362938d5a83633ad8d8a0dd63fa2
    Signed-off-by: “Manuel Buil” <mbuil@suse.com>
    (cherry picked from commit 89b68dcce2e79251e38e6231a3556b1bdc5fea79)

diff --git a/docs/submodules/sfc b/docs/submodules/sfc
index 0c355b4..6a9c9e6 160000 (submodule)
--- a/docs/submodules/sfc
+++ b/docs/submodules/sfc
@@ -1 +1 @@
-Subproject commit 0c355b40f1b523a24277bfed01fd9da82747aac4
+Subproject commit 6a9c9e69da60996ed3b738dd71b744df61cec9d7