fix java doc error

src/main/java/com/alibaba/druid/sql/dialect/antspark/ast/AntsparkCreateTableStatement.java

@@ -76,7 +76,7 @@ public class AntsparkCreateTableStatement extends SQLCreateTableStatement {
     }
 
     /**
-     * Getter method for property <tt>datasource</tt>.
+     * Getter method for property datasource.
      *
      * @return property value of datasource
      */

src/main/java/com/alibaba/druid/support/simplejndi/DruidDataSourceConverter.java

@@ -27,7 +27,7 @@ import java.util.Properties;
 
 /**
  * 支持simple-jndi
- * <h1>配置示例：</h1>
+ * <p>配置示例：</p>
  * <pre>
  * pgDruidTest/converter=com.alibaba.druid.support.simplejndi.DruidDataSourceConverter
  * pgDruidTest/type=javax.sql.DataSource

src/main/java/com/alibaba/druid/support/spring/MBeanServerFactoryBean.java

@@ -21,8 +21,8 @@ import javax.management.MBeanServer;
 
 import java.lang.management.ManagementFactory;
 
-public class MBeanServerFactoryBean implements FactoryBean<MBeanServer> {
-    public MBeanServer getObject() throws Exception {
+public class MBeanServerFactoryBean implements FactoryBean {
+    public Object getObject() throws Exception {
         return ManagementFactory.getPlatformMBeanServer();
     }
 
@@ -33,5 +33,4 @@ public class MBeanServerFactoryBean implements FactoryBean<MBeanServer> {
     public boolean isSingleton() {
         return true;
     }
-
 }