Update New-CsTeamsUnassignedNumberTreatment.md

Author: JensTrier

teams/teams-ps/teams/New-CsTeamsUnassignedNumberTreatment.md

@@ -159,6 +159,9 @@ Accept pipeline input: False
 Accept wildcard characters: False
 ```
 
+### CommonParameters
+This cmdlet supports the common parameters: -Debug, -ErrorAction, -ErrorVariable, -InformationAction, -InformationVariable, -OutVariable, -OutBuffer, -PipelineVariable, -Verbose, -WarningAction, and -WarningVariable. For more information, see [about_CommonParameters](https://go.microsoft.com/fwlink/?LinkID=113216).
+
 ## INPUTS
 
 ### None