Updating cmdlet with -AssignmentCategory example

[pavellatif]

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[learn-build-service-prod]

Learn Build status updates of commit 92366cd:

✅ Validation status: passed

File	Status	Preview URL	Details
teams/teams-ps/teams/Get-CsPhoneNumberAssignment.md	✅Succeeded	View (teams-ps)
teams/teams-ps/teams/Set-CsPhoneNumberAssignment.md	✅Succeeded	View (teams-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 d0494d2:

✅ Validation status: passed

File	Status	Preview URL	Details
teams/teams-ps/teams/Get-CsPhoneNumberAssignment.md	✅Succeeded	View (teams-ps)
teams/teams-ps/teams/Set-CsPhoneNumberAssignment.md	✅Succeeded	View (teams-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