Update git submodules

* Update docs/submodules/so.git from branch 'master'
  to 748ba79228f388edc1a9028f82e82475fd771fc1
  - Merge "Replace literals with constants. Replace repeated string literals with constants as per guidelines. Issue-ID: SO-1490"
  - Replace literals with constants.
    Replace repeated string literals with constants as per guidelines.
    Issue-ID: SO-1490

    Change-Id: Iffd4f5349f5e5c11daeb2ec76a75125c38a3e867
    Signed-off-by: h00397475 <hena.choudhury@huawei.com>

diff --git a/docs/submodules/so.git b/docs/submodules/so.git
index 34bf4b7..748ba79 160000 (submodule)
--- a/docs/submodules/so.git
+++ b/docs/submodules/so.git
@@ -1 +1 @@
-Subproject commit 34bf4b7fc4807033c02f21256f1a8c29a667c580
+Subproject commit 748ba79228f388edc1a9028f82e82475fd771fc1