{Docs} Fix extension installation command in documentation

[Darren Cohen (dargilco)]

🤖 PR Validation — ️✔️ All clear

Breaking Changes	Tests
️✔️ None	️✔️ 130/130

Summary

Correct the extension installation example to use the supported az extension add command instead of the invalid az extension install command. The install command does not exist per the help message:

>az extension --help

Group
    az extension : Manage and update CLI extensions.

Commands:
    add            : Add an extension.
    list           : List the installed extensions.
    list-available : List publicly available extensions.
    list-versions  : List available versions for an extension.
    remove         : Remove an extension.
    show           : Show an extension.
    update         : Update an extension.

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[Copilot]

🟢 Approval recommended

The change is a straightforward documentation correction that aligns the example with the supported Azure CLI command.

Pull request overview

This PR fixes the extension installation example in the extensions documentation by replacing an unsupported az extension install invocation with the supported az extension add command, aligning the docs with Azure CLI’s actual extension-management surface area.

Changes:

• Update the extension install example to use az extension add --name <extension-name>.

File summaries

File	Description
doc/extensions/README.md	Corrects the documented extension installation command to the supported az extension add syntax.

Review details

• Files reviewed: 1/1 changed files
• Comments generated: 0
• Review effort level: Lite

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[Aditya Pujara (a0x1ab)]

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[Ethan Yang (necusjz)]

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