Fix docs for temporalcloud_account_audit_log_sink resource

[khisakuni]

What was changed

Fixes the docs for the temporalcloud_account_audit_log_sink resource. The role_name field for the kinesis block expects the name of the role, not the ARN.

Why?

Checklist

1. Closes

2. How was this tested:

3. Any docs updates needed?

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Note

Low Risk
Low risk: documentation/schema description updates only, clarifying that kinesis.role_name expects a role name (not an ARN). No behavior or API interactions change.

Overview
Clarifies temporalcloud_account_audit_log_sink Kinesis configuration by documenting kinesis.role_name as the IAM role name (not the role ARN).

Updates the generated docs and Terraform examples accordingly, and aligns the provider schema descriptions in both the resource and data source to match the corrected meaning.

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