Yes, if you Void a credit invoice in Recurly, the new Status will sync over to Xero and change the Credit Note to Voided. One thing to keep in mind is that the Credit Note will be removed from the list of Invoices in Xero once it's voided. It will appear as if the credit note has been completely deleted from Xero, but it has just been moved and you can still look it up if needed.
To find a voided credit note in Xero:
Go to Business -> Invoices -> Search -> Enter the credit note # and check the box for "Include Deleted & Voided":
The credit note will be pulled and you can just click on it to view the details.