Azure CLI authentication documentation update

[Chambras]

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Description

Just a minor update to mention that starting with the new 4.0 version of the Azure Provider, it's now required to specify the Azure Subscription ID when configuring a provider instance in your configuration.

PR Checklist

• I have followed the guidelines in our Contributing Documentation.
• I have checked to ensure there aren't other open Pull Requests for the same update/change.
• I have checked if my changes close any open issues. If so please include appropriate closing keywords below.
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Testing

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This is a (please select all that apply):

• Bug Fix
• New Feature (ie adding a service, resource, or data source)
• Enhancement
• Breaking Change

Related Issue(s)

Fixes #27423

Note

If this PR changes meaningfully during the course of review please update the title and description as required.

[katbyte]

Thanks @Chambras - aside from one minor comment this LGTM 🏖️

[katbyte]

Thanks @Chambras - aside from one minor comment this LGTM 🏖️

[github-actions]

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