Add missing icon to Excel DataLink schema

[radeusgd]

Pull Request Description

I forgot to do this in the previous PR #9346, so following up.

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Checklist

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• The documentation has been updated, if necessary.
• Screenshots/screencasts have been attached, if there are any visual changes. For interactive or animated visual changes, a screencast is preferred.
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[radeusgd]

As discussed with @jdunkerley, to make it clearer that the user can hover over the text to see the explanation, I added an ℹ️ icon to the name, because the Default sheet name is not as clear, but we couldn't figure a much better one.