Install CLI on ARM64 with pip

[kgremban]

*Moved ARM64 line into its own Note box for easier scanability
*Added a recommendation for installing CLI on ARM64 based on conversations in Azure/azure-cli#7368 and MicrosoftDocs/azure-docs#80763

[opbld30]

Docs Build status updates of commit 8d68675:

✅ Validation status: passed

File	Status	Preview URL	Details
docs-ref-conceptual/includes/cli-install-linux-apt.md	✅Succeeded	View

For more details, please refer to the build report.

Note: Broken links written as relative paths are included in the above build report. For broken links written as absolute paths or external URLs, see the broken link report.

For any questions, please:

• Try searching the docs.microsoft.com contributor guides
• Post your question in the Docs support channel

[kgremban]

@jiasli @dbradish-microsoft

[dbradish-microsoft]

@jiasli , @taoyama as this PR has not had communication since September, 2021, I am closing this discussion. If you wish to resume this conversation please do so on Azure/azure-cli and open a new Issue. If a docs update is needed, the engineering team will create a work order.

[jiasli]

We are currently tracking the pip installation document issue in Azure/azure-cli#20476.