doc: 添加括号条件使用。

docs/zh/base/querywrapper.md

@@ -664,6 +664,30 @@ AND (sex =  ? OR sex =  ? )
 OR (age IN (?,?,?) AND user_name LIKE ? )
 ```
 
+## where 括号
+
+
+
+```java 6
+QueryWrapper queryWrapper = QueryWrapper.create()
+    .select()
+    .from(ACCOUNT)
+    .where(ACCOUNT.IS_DELETE.eq(0))
+    .and(ACCOUNT.ID.ge("1").and(
+        bracket(ACCOUNT.AGE.ge(18).or(ACCOUNT.USER_NAME.ge("zs")))
+    ))
+    .or(ACCOUNT.BIRTHDAY.le(new Date()));
+```
+
+其生成的 SQL 为：
+
+```sql
+SELECT * FROM `tb_account`
+WHERE `is_delete` = 0
+AND (`id` >= '1' AND (`age` >= 18 OR `user_name` >= 'zs'))
+OR `birthday` <= '2023-10-28 22:13:36'
+```
+
 ## 自定义字符串列名