Fixes #11024 - Add channel info to snap installer docs

[sdwheeler]

PR Summary

Add channel info to snap installer docs

• Fixes AB#252919
• Fixes Document not to use --edge with the Snap Preview package. #11024

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.
• Contributor's Guide: I have read the contributors guide.
• Style: This PR adheres to the style guide.

[learn-build-service-prod]

Learn Build status updates of commit 2e3bbb3:

✅ Validation status: passed

File	Status	Preview URL	Details
reference/docs-conceptual/install/install-other-linux.md	✅Succeeded	View (>=powershell-5.1)

For more details, please refer to the build report.

For any questions, please:

• Try searching the learn.microsoft.com contributor guides
• Post your question in the Learn support channel

[learn-build-service-prod]

Learn Build status updates of commit cb51ab9:

✅ Validation status: passed

File	Status	Preview URL	Details
reference/docs-conceptual/install/install-other-linux.md	✅Succeeded	View (>=powershell-5.1)

For more details, please refer to the build report.

For any questions, please:

• Try searching the learn.microsoft.com contributor guides
• Post your question in the Learn support channel