fixed javadoc

src/main/java/com/alibaba/druid/sql/dialect/mysql/ast/clause/MySqlDeclareConditionStatement.java

@@ -21,7 +21,6 @@ import com.alibaba.druid.sql.dialect.mysql.visitor.MySqlASTVisitor;
 /**
  * 
  * @author zhujun [455910092@qq.com]
- * @date 2016-04-14
  */
 public class MySqlDeclareConditionStatement extends MySqlStatementImpl{
 	

src/main/java/com/alibaba/druid/sql/dialect/mysql/ast/clause/MySqlDeclareHandlerStatement.java

@@ -24,7 +24,6 @@ import com.alibaba.druid.sql.dialect.mysql.visitor.MySqlASTVisitor;
 /**
  * 
  * @author zhujun [455910092@qq.com]
- * @date 2016-04-14
  */
 public class MySqlDeclareHandlerStatement extends MySqlStatementImpl{
 	

src/main/java/com/alibaba/druid/sql/dialect/mysql/ast/clause/MySqlHandlerType.java

@@ -18,7 +18,6 @@ package com.alibaba.druid.sql.dialect.mysql.ast.clause;
 /**
  * 
  * @author zhujun [zhujunxxxxx@163.com]
- * @date 2016-04-14
  */
 public enum MySqlHandlerType {
 	//DECLARE处理程序handler_type