fix dartdoc (dart-lang#716)

Author: kevmoo

source_gen/lib/src/utils.dart

@@ -20,7 +20,7 @@ import 'package:yaml/yaml.dart';
 /// typedef VoidFunc = void Function();
 /// ```
 ///
-/// This function will return `'VoidFunc'`, unlike [DartType.element.name].
+/// This function will return `'VoidFunc'`, unlike [DartType.element]`.name`.
 String typeNameOf(DartType type) {
  final aliasElement = type.alias?.element;
  if (aliasElement != null) {