Updated installation documentation to include ubuntu 26.04

[thomas-temby]

PR Summary

Added documentation for ubuntu 26.04

PR Checklist

• Descriptive Title: This PR's title is a synopsis of the changes it proposes.
• Summary: This PR's summary describes the scope and intent of the change.

[learn-build-service-prod]

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[learn-build-service-prod]

Learn Build status updates of commit 6893852:

✅ Validation status: passed

File	Status	Preview URL	Details
docs-ref-conceptual/Latest-version/includes/cli-install-linux-apt.md	✅Succeeded	View (azure-cli-latest)

For more details, please refer to the build report.

[mikefrobbins]

LGTM

[Copilot]

Pull request overview

Adds Ubuntu 26.04 to the “tested distributions” list in the Azure CLI APT installation include for the Latest documentation set.

Changes:

• Updates the supported/tested distro table to include Ubuntu 26.04 (Resolute Raccoon).
• Reflows the markdown table formatting/spacing.

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