#440 Update style file to correct the backward incompatibility

style/Style.xml

@@ -1,25 +1,4 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<!--
-    JetUML - A desktop application for fast UML diagramming.
-   
-    Copyright (C) 2021 by McGill University.
-        
-    See: https://github.com/prmr/JetUML
-   
-    This program is free software: you can redistribute it and/or modify
-    it under the terms of the GNU General Public License as published by
-    the Free Software Foundation, either version 3 of the License, or
-    (at your option) any later version.
-   
-    This program is distributed in the hope that it will be useful,
-    but WITHOUT ANY WARRANTY; without even the implied warranty of
-    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    GNU General Public License for more details.
-   
-    You should have received a copy of the GNU General Public License
-    along with this program.  If not, see http://www.gnu.org/licenses.
- -->
-
 <!DOCTYPE module PUBLIC "-//Checkstyle//DTD Checkstyle Configuration 1.3//EN" "https://checkstyle.org/dtds/configuration_1_3.dtd">
 
 <!--
@@ -33,7 +12,7 @@
   <property name="severity" value="warning"/>
   <module name="TreeWalker">
     <module name="JavadocMethod">
-      <property name="scope" value="protected"/>
+      <property name="accessModifiers" value="protected"/>
     </module>
     <module name="JavadocType">
       <property name="scope" value="package"/>