docs: update Multi-Cluster Warehouse screenshot

[awxxxxxx]

What is changed, added or deleted? (Required)

Update the Multi-Cluster Warehouse screenshot to reflect the current Advanced Options UI, including the Min Clusters setting.

Which TiDB version(s) do your changes apply to? (Required)

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• v7.1 (TiDB 7.1 versions)
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What is the related PR or file link(s)?

• This PR is translated from:
• Other reference link(s): https://docs.pingcap.com/tidbcloudlake/warehouse/#enabling-multi-cluster

AI agent involvement

• The changes in this PR were primarily made by an AI agent on behalf of the PR author.

Do your changes match any of the following descriptions?

• Delete files
• Change aliases
• Need modification after applied to another branch
• Might cause conflicts after applied to another branch

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