feat: update javadoc

Author: kienmatu

src/main/java/com/ly/doc/function/WordXmlEscape.java

@@ -22,8 +22,6 @@
 
 import java.util.LinkedHashMap;
 import java.util.Map;
-import java.util.regex.Matcher;
-import java.util.regex.Pattern;
 
 import com.ly.doc.utils.DocUtil;
 import org.beetl.core.Context;
@@ -32,6 +30,9 @@
 
 /**
  * Function to escape XML content in Beetl templates.
+ * <p>
+ * For example, it replaces:
+ * - <code>" "</code> with <code> </code>
  *
  * @author yu 2021/6/26.
  */