DOC: Added missing endverbatim and minor tidying

src/thermophysicalModels/radiation/submodels/wallAbsorptionEmissionModel/solidAbsorption/solidAbsorption.H

@@ -27,17 +27,18 @@ Class
 
 Description
     Radiation absorptivity-emissivity model to be used on walls on
-    inter-regions patches when the solid opaque radiation model  is used
+    inter-region patches when the solid opaque radiation model is used
     in the solid and the wall emissivity and absorptivity are taken from
     the solid radiation properties
 
 Usage
+    Example usage
     \verbatim
-
         wallAbsorptionEmissionModel
         {
             type            solidAbsorption;
         };
+    \endverbatim
 
 
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