Update Add-Computer.md

[HerbertMauerer]

specify DNS FQDN is required. it is a regression, but really the change is makes is good...

PR Summary

• Descriptive Title: spell out DNS FQDN name of DC is required.
• Summary: There is a regression in the rejoin scenario. but really the need it reaises is a good idea.
• Contributor's Guide: Yes
• Style: Yes.

[learn-build-service-prod]

Learn Build status updates of commit 5c5b3b4:

✅ Validation status: passed

File	Status	Preview URL	Details
reference/5.1/Microsoft.PowerShell.Management/Add-Computer.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

[github-actions]

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[learn-build-service-prod]

Learn Build status updates of commit 6fa8ad0:

✅ Validation status: passed

File	Status	Preview URL	Details
reference/5.1/Microsoft.PowerShell.Management/Add-Computer.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