fix: cloud advanced usage for cn

[everpcpc]

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Project	Deployment	Preview	Comments	Updated (UTC)
docs	Ready	Preview	Comment	Nov 7, 2025 10:20am

[chatgpt-codex-connector]

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databend-docs/docs/cn/guides/20-cloud/30-advanced/01-iam-role/01-aws.md

Lines 74 to 78 in 34d7778

	4. 在 Databend Cloud 工作区或 `BendSQL` 中执行以下 SQL 语句：
	```sql
	CREATE CONNECTION databend_test STORAGE_TYPE = 's3' ROLE_ARN = 'arn:aws:iam::987654321987:role/databend-test';

Include EXTERNAL_ID when role trust requires it

The trust policy example now enforces sts:ExternalId ("Condition": { "StringEquals": { "sts:ExternalId": "my-external-id-123" }}), but the connection creation SQL below still omits the EXTERNAL_ID parameter. When the role’s policy requires an external ID, CREATE CONNECTION ... ROLE_ARN = ... without EXTERNAL_ID will fail with AccessDenied because the assume-role call does not supply the required external ID. The sample should either show how to obtain the external ID and pass it (for example EXTERNAL_ID = 'my-external-id-123') or remove the condition. As written, following the instructions will not work.

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