fix some format

docs-2.0/3.ngql-guide/4.variable-and-composite-queries/1.composite-queries.md

@@ -46,20 +46,20 @@ Nebula Graph支持三种方式进行复合查询（或子查询）：
 
     # 插入多个点。
     nebula> INSERT VERTEX player(name, age) VALUES "player100":("Tim Duncan", 42); \
-    INSERT VERTEX player(name, age) VALUES "player101":("Tony Parker", 36); \
-    INSERT VERTEX player(name, age) VALUES "player102":("LaMarcus Aldridge", 33);
+            INSERT VERTEX player(name, age) VALUES "player101":("Tony Parker", 36); \
+            INSERT VERTEX player(name, age) VALUES "player102":("LaMarcus Aldridge", 33);
     ```
 
 - 原生nGQL（管道符）
 
     ```ngql
     # 管道符连接多个查询。
     nebula> GO FROM "player100" OVER follow YIELD follow._dst AS id | \
-        GO FROM $-.id OVER serve YIELD $$.team.name AS Team, \
-        $^.player.name AS Player;
-        +---------+-------------+
-        | Team    | Player      |
-        +---------+-------------+
-        | Nuggets | Tony Parker |
-        +---------+-------------+
-    ```
+            GO FROM $-.id OVER serve YIELD $$.team.name AS Team, \
+            $^.player.name AS Player;
+    +---------+-------------+
+    | Team    | Player      |
+    +---------+-------------+
+    | Nuggets | Tony Parker |
+    +---------+-------------+
+    ```