Remove comment link to closed PowerShell Alpine ARM issue (#6370)

Author: lbussell

tests/Microsoft.DotNet.Docker.Tests/ProductImageData.cs

@@ -20,9 +20,7 @@ public record ProductImageData : ImageData
 
         public bool GlobalizationInvariantMode => !SupportsGlobalization;
 
-        // PowerShell does not support Arm-based Alpine, skip testing
-        // https://github.com/PowerShell/PowerShell/issues/14667
-        // https://github.com/PowerShell/PowerShell/issues/12937
+        // PowerShell does not support Arm-based Alpine
         public bool SupportsPowerShell => !(OS.Contains("alpine") && IsArm);
 
         public string SdkOS