Update git submodules

* Update docs/submodules/modeling/modelspec.git from branch 'master'
  to 54135a2dbdbf732d07c4cc6ea4a1de8d906fbf54
  - Pnf - updated accepted to Preliminary
    
    Updated Pnf classes and attributes accepted in R4 from Experimental to
    Preliminary
    
    Issue-ID: MODELING-104
    
    Change-Id: Ib8f5c93945560dcc5a31b70a5f90cfce4ca0b318
    
    
    Change-Id: Ib8f5c93945560dcc5a31b70a5f90cfce4ca0b318
    Signed-off-by: Kevin Scaggs <ks0567@att.com>
    
1 file changed