whole_func_string: function genEntityDescription(data, kind, entityName) {
      return data({kind: kind, name: entityName}).select('description').join('\n\n');
  }
func_code_string: function genEntityDescription(data, kind, entityName) {
      return data({kind: kind, name: entityName}).select('description').join('\n\n');
  }
func_documentation_string: Generates description for a bem entity by merging
  doclets descriptions from all levels