Update git submodules

* Update docs/submodules/vnfsdk/model.git from branch 'master'
  to bc72d112aa72968b21f8e7270e02510ff52d99a3
  - Merge "Documentation update"
  - Documentation update
    
    Change-Id: I4cc65075581b28bd864a121d4067bde67472eef1
    Issue-ID: VNFSDK-338
    Signed-off-by: Zebek Bogumil <bogumil.zebek@nokia.com>
    
1 file changed