Update git submodules

* Update docs/submodules/so.git from branch 'master'
  to b72390681e48bcec222b789d9b19c18cf5295178
  - Merge "Shift String literal to left-hand side of equals"
  - Shift String literal to left-hand side of equals

    Shift String literal to left-hand side of equals DSLNodeKey class

    Issue-ID: SO-1490

    Change-Id: If9c15394876e8e662fc10501c90382861dfbced9
    Signed-off-by: Sindhuri.A <arcot.sindhuri@huawei.com>

diff --git a/docs/submodules/so.git b/docs/submodules/so.git
index 89fe06c..b723906 160000 (submodule)
--- a/docs/submodules/so.git
+++ b/docs/submodules/so.git
@@ -1 +1 @@
-Subproject commit 89fe06caf3148393fb7f1e2f78e786c7074f7c7a
+Subproject commit b72390681e48bcec222b789d9b19c18cf5295178