Update git submodules

* Update docs/submodules/so.git from branch 'master'
  to b503889326deea3fe0869b6ae07d6ce1d2810006
  - Fix for SO-2855
    
    Change-Id: Ic60becb234f43a086bec5e594885422ceeda210f
    Issue-ID: SO-2855
    Signed-off-by: waqas.ikram <waqas.ikram@est.tech>
    
diff --git a/docs/submodules/so.git b/docs/submodules/so.git
index 788ada8..b503889 160000
--- a/docs/submodules/so.git
+++ b/docs/submodules/so.git
@@ -1 +1 @@
-Subproject commit 788ada8a8c280e7599c46281804468d0e468d42b
+Subproject commit b503889326deea3fe0869b6ae07d6ce1d2810006