Update aks-extension-kaito.md

[lukemurraynz]

This pull request includes updates to the articles/aks/aks-extension-kaito.md file, focusing on improving clarity and correcting terminology. Below are the key changes grouped by theme:

Documentation Clarity Improvements:

• Updated the prerequisite description for the Azure Kubernetes Service (AKS) extension to clarify that it "has been downloaded" and added a note specifying that KAITO can only be installed on Standard Clusters, not Automatic clusters.

Terminology Corrections:

• Changed "inferencing deployment" to "inference deployment" in the instructions for deleting model inference deployments to use the correct terminology.

[prmerger-automator]

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[learn-build-service-prod]

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[Court72]

@qpetraroia

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"
@MicrosoftDocs/public-repo-pr-review-team