Docs: Fix local tests example in the Idempotency Testing Your Code section

[leandrodamascena]

What were you searching in the docs?

Improve the documentation by changing the example to be more realistic.

Is this related to an existing documentation section?

Idempotency

How can we improve?

Changing documentation

Got a suggestion in mind?

No response

Acknowledgment

• I understand the final update might be different from my proposed suggestion, or refused.

[heitorlessa]

removing triage...

[heitorlessa]

only last comment before merging is that this part shouldn't work, please double check in case I'm wrong: https://github.com/awslabs/aws-lambda-powertools-python/pull/2073/files#diff-e612f95a3dbd33cabab2e49899653b8cc5d5e809bfad45aa54cdee41d22e5808R1253

Reason. Unless AWS SDK changed, the DynamoDB client wouldn't connect to DynamoDB Local because the client isn't being replaced, therefore it'd use the real DynamoDB external endpoint.

[github-actions]

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[github-actions]

This is now released under 2.12.0 version!