Clarify that Import-VM expects .vmcx file

[hickford]

PR Summary

Clarify that Import-VM expects .vmcx file.

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.

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[learn-build-service-prod]

Learn Build status updates of commit ae2e02b:

✅ Validation status: passed

File	Status	Preview URL	Details
docset/winserver2022-ps/hyper-v/Import-VM.md	✅Succeeded	View (WindowsServer2022-ps)

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 06d9bd2:

✅ Validation status: passed

File	Status	Preview URL	Details
docset/winserver2022-ps/hyper-v/Import-VM.md	✅Succeeded	View (WindowsServer2022-ps)

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