Update notebooks.md to set audience key for token

[dbrownems]

Per docs https://learn.microsoft.com/en-us/fabric/data-engineering/notebook-utilities#get-token

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[Jak-MS]

@YaelSchuster
Can you review the proposed changes?

Important: When the changes are ready for publication, adding a #sign-off comment is the best way to signal that the PR is ready for the review team to merge.

#label:"aq-pr-triaged"
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[ag-ramachandran]

Hello @dbrownems , This change may not be needed.

When we use the 'kusto' keyword, the AUD of this token is help.kusto.windows.net and when using the Uri as in the doc it points to the specific Kusto cluster being accessed.

Is there a specific reason you are requesting this change ?

[dbrownems]

Using the URI is not documented, and stopped working for scheduled notebook runs.

[ag-ramachandran]

Looks like there was a change in the mssparkutils API that makes this change warranted.

LGTM

@YaelSchuster , we can approve this change