TurbulenceModels: Corrected docs

Reported in http://www.openfoam.org/mantisbt/view.php?id=1856

src/TurbulenceModels/compressible/SpecificCompressibleTurbulenceModel/SpecificCompressibleTurbulenceModel.H

@@ -81,7 +81,7 @@ public:
 
     // Selectors
 
-        //- Return a reference to the selected RAS model
+        //- Return a reference to the selected turbulence model
         static autoPtr<SpecificCompressibleTurbulenceModel> New
         (
             const volScalarField& rho,

src/TurbulenceModels/incompressible/SpecificIncompressibleTurbulenceModel/SpecificIncompressibleTurbulenceModel.H

@@ -81,7 +81,7 @@ public:
 
     // Selectors
 
-        //- Return a reference to the selected RAS model
+        //- Return a reference to the selected turbulence model
         static autoPtr<SpecificIncompressibleTurbulenceModel> New
         (
             const volVectorField& U,