Update git submodules

* Update docs/submodules/usecase-ui.git from branch 'master'
  to 3693e5dc472cb59fbb03dba2534c507b51104d8a
  - docs: add user guide
    
    Change-Id: I7d8f77b5299466e066deb93f20be1704d4dab189
    Issue-ID: USECASEUI-307
    Signed-off-by: cyuamber <xuranyjy@chinamobile.com>
    
1 file changed