Update custom-domain.md

corrected spelling of "Punycode"

Author: gabesmsft

articles/static-web-apps/custom-domain.md

@@ -25,7 +25,7 @@ The following table includes links to articles that demonstrate how to configure
 <sup>1</sup> Some registrars like GoDaddy and Google don't support domain records that affect how you configure your apex domain. Consider using [Azure DNS](custom-domain-azure-dns.md) with these registrars to set up your apex domain.
 
 > [!NOTE]
-> Adding a custom domain to a [preview environment](preview-environments.md) is not supported. Unicode domains, including Pynocode domains and the `xn--` prefix are also not supported.
+> Adding a custom domain to a [preview environment](preview-environments.md) is not supported. Unicode domains, including Punycode domains and the `xn--` prefix are also not supported.
 
 ## About domains