docs: add ALTER PIPE SQL reference

docs/cn/sql-reference/10-sql-commands/00-ddl/17-pipe/_category_.json

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+{"label":"Pipe","position":17}

docs/cn/sql-reference/10-sql-commands/00-ddl/17-pipe/alter-pipe.md

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+---
+title: ALTER PIPE
+sidebar_position: 1
+---
+
+修改一个 pipe。
+
+## 语法
+
+```sql
+ALTER PIPE [ IF EXISTS ] <name> SET PIPE_EXECUTION_PAUSED = <bool>
+ALTER PIPE [ IF EXISTS ] <name> SET COMMENTS = '<comment>'
+ALTER PIPE [ IF EXISTS ] <name> REFRESH [ PREFIX = '<prefix>' ] [ MODIFIED_AFTER = '<timestamp>' ]
+```
+
+## 示例
+
+```sql
+ALTER PIPE my_pipe SET PIPE_EXECUTION_PAUSED = true;
+ALTER PIPE my_pipe REFRESH PREFIX = '2025/';
+```

docs/cn/sql-reference/10-sql-commands/00-ddl/17-pipe/index.md

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+---
+title: Pipe
+---
+| 命令 | 描述 |
+|---------|-------------|
+| [ALTER PIPE](alter-pipe.md) | 修改 pipe 的执行或刷新行为 |

docs/cn/sql-reference/10-sql-commands/00-ddl/index.md

@@ -38,6 +38,7 @@ title: DDL（Data Definition Language）命令
 | 组件 | 描述 |
 |-----------|-------------|
 | **[暂存区 (Stage)](03-stage/index.md)** | 为数据加载定义存储位置 |
+| **[Pipe](17-pipe/index.md)** | 修改基于 `COPY INTO` 的导入管道 |
 | **[流 (Stream)](04-stream/index.md)** | 捕获和处理数据变更 |
 | **[任务 (Task)](04-task/index.md)** | 调度和自动化 SQL 操作 |
 | **[序列 (Sequence)](04-sequence/index.md)** | 生成唯一的序列号 |

docs/en/sql-reference/10-sql-commands/00-ddl/17-pipe/_category_.json

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+{"label":"Pipe","position":17}

docs/en/sql-reference/10-sql-commands/00-ddl/17-pipe/alter-pipe.md

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+---
+title: ALTER PIPE
+sidebar_position: 1
+---
+
+Modifies a pipe.
+
+## Syntax
+
+```sql
+ALTER PIPE [ IF EXISTS ] <name> SET PIPE_EXECUTION_PAUSED = <bool>
+ALTER PIPE [ IF EXISTS ] <name> SET COMMENTS = '<comment>'
+ALTER PIPE [ IF EXISTS ] <name> REFRESH [ PREFIX = '<prefix>' ] [ MODIFIED_AFTER = '<timestamp>' ]
+```
+
+## Example
+
+```sql
+ALTER PIPE my_pipe SET PIPE_EXECUTION_PAUSED = true;
+ALTER PIPE my_pipe REFRESH PREFIX = '2025/';
+```

docs/en/sql-reference/10-sql-commands/00-ddl/17-pipe/index.md

@@ -0,0 +1,6 @@
+---
+title: Pipe
+---
+| Command | Description |
+|---------|-------------|
+| [ALTER PIPE](alter-pipe.md) | Modifies pipe execution or refresh behavior |

docs/en/sql-reference/10-sql-commands/00-ddl/index.md

@@ -38,6 +38,7 @@ These topics provide reference information for the DDL (Data Definition Language
 | Component | Description |
 |-----------|-------------|
 | **[Stage](03-stage/index.md)** | Define storage locations for data loading |
+| **[Pipe](17-pipe/index.md)** | Modify ingestion pipes backed by `COPY INTO` |
 | **[Stream](04-stream/index.md)** | Capture and process data changes |
 | **[Task](04-task/index.md)** | Schedule and automate SQL operations |
 | **[Sequence](04-sequence/index.md)** | Generate unique sequential numbers |