changes according to review

MaterialLib/MPL/Properties/CreateRelPermBrooksCorey.cpp

@@ -36,7 +36,7 @@ std::unique_ptr<RelPermBrooksCorey> createRelPermBrooksCorey(
     auto const exponent =
         //! \ogs_file_param{prj__media__medium__properties__property__RelPermBrooksCorey__lambda}
         config.getConfigParameter<double>("lambda");
-    if (exponent == 0.)
+    if (exponent <= 0.)
     {
         OGS_FATAL("Exponent 'lambda' must be positive.");
     }

MaterialLib/MPL/Properties/RelPermBrooksCorey.cpp

@@ -26,7 +26,6 @@ RelPermBrooksCorey::RelPermBrooksCorey(
     const double min_relative_permeability_liquid,
     const double min_relative_permeability_gas,
     const double exponent)
-
     : _residual_liquid_saturation(residual_liquid_saturation),
       _residual_gas_saturation(residual_gas_saturation),
       _min_relative_permeability_liquid(min_relative_permeability_liquid),

MaterialLib/MPL/Properties/RelPermBrooksCorey.h

@@ -45,7 +45,7 @@ public:
                        const double /*_min_relative_permeability_gas*/,
                        const double /*exponent*/
     );
-    /// This method assigns a pointer to the meterial object that is the owner
+    /// This method assigns a pointer to the material object that is the owner
     /// of this property
     void setScale(
         std::variant<Medium*, Phase*, Component*> scale_pointer) override