Update git submodules

* Update docs/submodules/usecase-ui.git from branch 'master'
  to 539ffea7725b9475118c84c35a49ae5024bd7a79
  - feat: Modify the parameters submitted when nsmf is created
    
    Change-Id: I13f59ed32d3d6f8be5404a8876164764feec35e1
    Issue-ID: USECASEUI-368
    Signed-off-by: cyuamber <xuranyjy@chinamobile.com>
    
diff --git a/docs/submodules/usecase-ui.git b/docs/submodules/usecase-ui.git
index 8189d66..539ffea 160000
--- a/docs/submodules/usecase-ui.git
+++ b/docs/submodules/usecase-ui.git
@@ -1 +1 @@
-Subproject commit 8189d6613964ac90995dfac73d33c05af695bd87
+Subproject commit 539ffea7725b9475118c84c35a49ae5024bd7a79