Code snippet for Mutex.OpenExisting in .NET Core calls non-existing methods

The example makes a call to a four-parameter Mutex constructor `public Mutex (bool initiallyOwned, string name, out bool createdNew, System.Security.AccessControl.MutexSecurity mutexSecurity)` that doesn't exist in .NET Core. A call to `public static System.Threading.Mutex Create (bool initiallyOwned, string? name, out bool createdNew, System.Security.AccessControl.MutexSecurity? mutexSecurity)` should be used instead.

It also calls a two-parameter `public static System.Threading.Mutex OpenExisting (string name, System.Security.AccessControl.MutexRights rights)` method that should be changed to a call to `public static System.Threading.Mutex OpenExisting (string name, System.Security.AccessControl.MutexRights rights)`