Update git submodules

* Update docs/submodules/so.git from branch 'master'
  to bb56dd69512406f8d8bb709b8c84e7d09b4a239c
  - Merge "Define constant in place of repeated literals."
  - Define constant in place of repeated literals.

    Defined a constant instead of repeatedly using literals.

    Issue-ID: SO-1490

    Change-Id: I4fc4eddeebf42436d6198ba92d7c8bfa8f3394b0
    Signed-off-by: h00397475 <hena.choudhury@huawei.com>

diff --git a/docs/submodules/so.git b/docs/submodules/so.git
index f173b99..bb56dd6 160000 (submodule)
--- a/docs/submodules/so.git
+++ b/docs/submodules/so.git
@@ -1 +1 @@
-Subproject commit f173b99450f252da6e938694a31383c4d91db00a
+Subproject commit bb56dd69512406f8d8bb709b8c84e7d09b4a239c