Update git submodules

* Update docs/submodules/sfc from branch 'stable/fraser'
  - Update release notes for Fraser 6.2

    Depends-On: https://gerrit.opnfv.org/gerrit/#/c/59177/

    Change-Id: I0d56aa4d5f494a25db92e61415a24b4257c71a04
    Signed-off-by: Manuel Buil <mbuil@suse.com>
    (cherry picked from commit a52c05a07b2a01b8c911537d29c995fb42f66972)

diff --git a/docs/submodules/sfc b/docs/submodules/sfc
index 7d4bbcc..297052a 160000 (submodule)
--- a/docs/submodules/sfc
+++ b/docs/submodules/sfc
@@ -1 +1 @@
-Subproject commit 7d4bbcc9fe1819f11c7b757f8c074db488baee4b
+Subproject commit 297052a5aa6dd596443930e8ad0d2754b70f79ba