moving apidiff out of preview (#3595)

release-notes/3.0/api-diff/.Net/3.0.0_System.ComponentModel.md

@@ -0,0 +1,25 @@
+# System.ComponentModel
+
+``` diff
+ namespace System.ComponentModel {
+     public class BackgroundWorker : Component {
++        protected override void Dispose(bool disposing);
+     }
+     public abstract class BaseNumberConverter : TypeConverter {
+-        protected BaseNumberConverter();
+
+     }
++    public class VersionConverter : TypeConverter {
++        public VersionConverter();
++        public override bool CanConvertFrom(ITypeDescriptorContext context, Type sourceType);
++        public override bool CanConvertTo(ITypeDescriptorContext context, Type destinationType);
++        public override object ConvertFrom(ITypeDescriptorContext context, CultureInfo culture, object value);
++        public override object ConvertTo(ITypeDescriptorContext context, CultureInfo culture, object value, Type destinationType);
++        public override bool IsValid(ITypeDescriptorContext context, object value);
++    }
+     public class Win32Exception : ExternalException, ISerializable {
++        public override string ToString();
+     }
+ }
+```
+