修复更多的warning，尤其是导致打包warning的不规范或不必要的javadoc

weixin-java-mp/src/main/java/me/chanjar/weixin/mp/util/xml/XStreamTransformer.java

@@ -14,10 +14,6 @@ public class XStreamTransformer {
 
   /**
    * xml -> pojo
-   *
-   * @param clazz
-   * @param xml
-   * @return
    */
   @SuppressWarnings("unchecked")
   public static <T> T fromXml(Class<T> clazz, String xml) {
@@ -43,10 +39,6 @@ public class XStreamTransformer {
 
   /**
    * pojo -> xml
-   *
-   * @param clazz
-   * @param object
-   * @return
    */
   public static <T> String toXml(Class<T> clazz, T object) {
     return CLASS_2_XSTREAM_INSTANCE.get(clazz).toXML(object);