commend added

Author: Malarg

lib/src/code_modifiers/close_block_code_modifier.dart

@@ -5,6 +5,8 @@ import 'package:flutter/widgets.dart';
 import '../code_field/editor_params.dart';
 import 'code_modifier.dart';
 
+/// [CloseBlockModifier] is an implementation of [CodeModifier] 
+/// that remove spaces before the closing bracket, if required.
 class CloseBlockModifier extends CodeModifier {
   const CloseBlockModifier() : super('}');