Makazeu

Results 2 issues of Makazeu

## Summary Fixed the typo "curent" in `csharp/System.Security/SecureString/AppendChar/xat.cs` and `visualbasic/VS_Snippets_CLR/SecureString.xAt/VB/xat.vb` doc page: https://learn.microsoft.com/en-us/dotnet/api/system.security.securestring.appendchar?view=net-8.0

area-System.Security
community-contribution