Change docstring to denote that this is deprecated

refs idaholab#19564

framework/include/actions/AddVariableAction.h

@@ -52,7 +52,7 @@ class AddVariableAction : public MooseObjectAction
   static FEType feType(const InputParameters & params);
 
   /**
-   * determine the variable type given an FEType and number of components
+   * DEPRECATED: Use variableType instead
    */
   static std::string
   determineType(const FEType & fe_type, unsigned int components, bool is_fv = false);