Update git submodules

* Update docs/submodules/usecase-ui.git from branch 'master'
  to 5978085f3b08b836e9db75c83791379b1592dd93
  - Page style created by CCVPN instance
    
    Change-Id: I281c28ffb640d9cdaa220e89099f1f63960667c2
    Issue-ID: USECASEUI-220
    Signed-off-by: guochuyicmri <guochuyi@chinamobile.com>
    
1 file changed