docs: add drop table to reference

docs/nightly/en/reference/sql/drop.md

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+# DROP
+
+## DROP TABLE
+
+`DROP TABLE` removes tables from the database. It will remove the table definition and all table data, indexes, rules, and constraints for that table.
+
+### Syntax
+
+```sql
+DROP TABLE [ IF EXISTS ] table_name [, ...]
+```
+
+- `IF EXISTS`: Do not throw an error if the table does not exist.
+- `table_name`: The name of the table to remove.
+
+
+### Examples
+
+To destroy two tables, `monitor` and `system_metrics`:
+
+```sql
+DROP TABLE monitor, system_metrics;
+```

docs/nightly/en/summary.yml

@@ -146,6 +146,7 @@
     - insert
     - cast
     - copy
+    - drop
     - select
     - distinct
     - where

docs/nightly/zh/reference/sql/drop.md

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+# DROP
+
+## DROP TABLE
+
+`DROP TABLE` 从数据库中删除表，它将删除该表的表定义和所有表数据、索引、规则和约束。
+
+### 语法
+
+```sql
+DROP TABLE [ IF EXISTS ] table_name [, ...]
+```
+
+- `IF EXISTS`: 如果表不存在，则不抛出错误。
+- `table_name`: 要删除的表的名称。
+
+### 示例
+
+删除表 `monitor` 和 `system_metrics`：
+
+```sql
+DROP TABLE monitor, system_metrics;
+```