Update git submodules

* Update docs/submodules/usecase-ui.git from branch 'master'
  to 237ed72e04ae121297a0594be069a26db49d0f5b
  - New committer promotion for Ran Xu
    
    Change-Id: Ia18c4fb1853c2d9367dfb89e4b7aa8a00e42e791
    Issue-ID: USECASEUI-347
    Signed-off-by: shentao999 <shentao@chinamobile.com>
    
diff --git a/docs/submodules/usecase-ui.git b/docs/submodules/usecase-ui.git
index 37a9b75..237ed72 160000
--- a/docs/submodules/usecase-ui.git
+++ b/docs/submodules/usecase-ui.git
@@ -1 +1 @@
-Subproject commit 37a9b7568d46b6abc83be71b08bd5a0c7d083e54
+Subproject commit 237ed72e04ae121297a0594be069a26db49d0f5b