Update git submodules

* Update docs/submodules/so.git from branch 'master'
  to 621dd5b5b4f0e5058c86fe84926deb11e883b36c
  - initial commit for the release notes

    Issue-ID: SO-2260

    Signed-off-by: seshukm <seshu.kumar.m@huawei.com>
    Change-Id: I408496eef933396c700b4676736a4cfa78507b4e
    (cherry picked from commit f5d05f899c17f7c69a6a584d4e0c8c6ed8984630)

diff --git a/docs/submodules/so.git b/docs/submodules/so.git
index 3206fe8..621dd5b 160000 (submodule)
--- a/docs/submodules/so.git
+++ b/docs/submodules/so.git
@@ -1 +1 @@
-Subproject commit 3206fe8b78f00e7003eb57aa1621e66fee0811d5
+Subproject commit 621dd5b5b4f0e5058c86fe84926deb11e883b36c