(AB-167446) Sync docs for `alpha.3`

[michaeltlombardi]

PR Summary

This change pulls over the reference documentation updates for the alpha.3 release of DSCv3.

• Fixes AB#167446

PR Checklist

• [x] Descriptive Title: This PR's title is a synopsis of the changes it proposes.
• [x] Summary: This PR's summary describes the scope and intent of the change.
• [x] Contributor's Guide: I have read the contributors guide.
• [x] Style: This PR adheres to the style guide.

[learn-build-service-prod[bot]]

Learn Build status updates of commit fe8e6e5:

:white_check_mark: Validation status: passed

File	Status	Preview URL	Details
dsc/docs-conceptual/dsc-3.0/changelog.md	:white_check_mark:Succeeded	View (dsc-3.0)
dsc/docs-conceptual/dsc-3.0/reference/cli/resource/set.md	:white_check_mark:Succeeded	View (dsc-3.0)
dsc/docs-conceptual/dsc-3.0/reference/schemas/resource/manifest/get.md	:white_check_mark:Succeeded	View (dsc-3.0)
dsc/docs-conceptual/dsc-3.0/reference/schemas/resource/manifest/root.md	:white_check_mark:Succeeded	View (dsc-3.0)
dsc/docs-conceptual/dsc-3.0/reference/schemas/resource/manifest/set.md	:white_check_mark:Succeeded	View (dsc-3.0)
dsc/docs-conceptual/dsc-3.0/reference/schemas/resource/manifest/test.md	:white_check_mark:Succeeded	View (dsc-3.0)

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[bot]]

Learn Build status updates of commit 6213fa8:

:white_check_mark: Validation status: passed

File	Status	Preview URL	Details
dsc/docs-conceptual/dsc-3.0/changelog.md	:white_check_mark:Succeeded	View (dsc-3.0)
dsc/docs-conceptual/dsc-3.0/reference/cli/resource/set.md	:white_check_mark:Succeeded	View (dsc-3.0)
dsc/docs-conceptual/dsc-3.0/reference/schemas/resource/manifest/get.md	:white_check_mark:Succeeded	View (dsc-3.0)
dsc/docs-conceptual/dsc-3.0/reference/schemas/resource/manifest/root.md	:white_check_mark:Succeeded	View (dsc-3.0)
dsc/docs-conceptual/dsc-3.0/reference/schemas/resource/manifest/set.md	:white_check_mark:Succeeded	View (dsc-3.0)
dsc/docs-conceptual/dsc-3.0/reference/schemas/resource/manifest/test.md	:white_check_mark:Succeeded	View (dsc-3.0)

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