aks-preview: Update bastion instructions to no longer need --server option on newer AKS preview extension

[bennerv]

Once Azure/azure-cli-extensions#9415 is merged, it is no longer necessary to specify the --server option as it edits the kubeconfig in place to point to the correct server.

[prmerger-automator]

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[learn-build-service-prod]

Learn Build status updates of commit b51106e:

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articles/bastion/bastion-connect-to-aks-private-cluster.md	✅Succeeded

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[Copilot]

Pull Request Overview

Updates Azure Bastion documentation to reflect changes in the aks-preview extension (version 19.0.0b16+) where the --server option is no longer required for kubectl commands when connecting to AKS private clusters through Bastion tunnels.

• Simplified kubectl command example by removing the --server parameter
• Added a note explaining the version-specific behavior for older aks-preview extensions
• Updated code block language identifiers from pwsh to azurecli and bash for better syntax highlighting

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[Copilot]

The note should clarify what behavior to expect with version 19.0.0b16 and above, not just what's required for older versions. Consider rephrasing to: 'For aks-preview versions 19.0.0b15 and below, you must specify the --server=https://localhost:<LocalMachinePort> option on all kubectl commands. Version 19.0.0b16 and above automatically configures the kubeconfig to point to the correct server.'

Suggested change

	> For aks-preview versions 19.0.0b15 and below, you have to specify the `--server=https://localhost:<LocalMachinePort>` on all `kubectl` commands.
	> For aks-preview versions 19.0.0b15 and below, you must specify the `--server=https://localhost:<LocalMachinePort>` option on all `kubectl` commands. Version 19.0.0b16 and above automatically configures the kubeconfig to point to the correct server.

[ShannonLeavitt]

@AbdullahBell

Can you review the proposed changes?

Due to the upcoming conference, all merging and publishing is on hold until the morning of 18 November 2025.

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

[bennerv]

We should /hold on this as the version in the note might change based on https://github.com/Azure/azure-cli-extensions/pull/9415/files