Update diagnostic-settings.md

[DarrenTurchiarelli]

Added an additional line item to the 'Requirements and Limitations' subsection.

When specifying a Log Analytics Workspace as the diagnostic setting log destination, there's no need to explicitly define an identity. This is managed within the Azure platform.

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[v-dirichards]

@bwren

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[v-dirichards]

@DarrenTurchiarelli The https://learn.microsoft.com/en-us/azure/azure-monitor/platform/diagnostic-settings has been substantially updated or deleted, and this change no longer applies. If you'd still like to update the article, please open a new PR. Or if you believe this PR was closed by mistake, email the PublicPRs alias.

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