Clarify NU3043 being an error in .NET 10 (#3396)

Author: zivkan

docs/reference/errors-and-warnings/NU3043.md

@@ -13,7 +13,7 @@ f1_keywords:
 > Invalid value for `--certificate-fingerprint` option in the `dotnet nuget sign` command or the `CertificateFingerprint` option in the `NuGet.exe sign` command.
 The value must be a SHA-256, SHA-384, or SHA-512 certificate fingerprint (in hexadecimal).
 
-> This warning will be promoted to an error around the .NET 10 timeframe.
+This warning is promoted to an error in the .NET 10 SDK, and will be promoted to an error in NuGet.exe around .NET 10's release.
 
 ## Issue