Update git submodules

* Update docs/submodules/policy/parent.git from branch 'master'
  to 39290a743d097a4f4a8996d07bf5af46127c23d3
  - Delete VOLTE tutorial
    
    Issue-ID: POLICY-1851
    Signed-off-by: jhh <jorge.hernandez-herrero@att.com>
    Change-Id: I846db7b37547615774e5edbe776817ec31a9b784
    
1 file changed