Use ThreadStaticAttribute instead of NonSerializable

standard/classes.md

@@ -3454,23 +3454,22 @@ Although the backing field is hidden, that field may have field-targeted attribu
 > ```csharp
 > public class Foo
 > {
->     [field: NonSerialized]
->     public string MySecret { get; set; }
+>     [field: ThreadStatic]
+>     public string ThreadStaticProperty { get; set; }
 > }
 > ```
 >
-> results in the field-targeted attribute `NonSerialized` being applied to the compiler-generated backing field, as if the code had been written as follows:
+> results in the field-targeted attribute `ThreadStaticAttribute` being applied to the compiler-generated backing field, as if the code had been written as follows:
 >
 > ```csharp
-> [Serializable]
 > public class Foo
 > {
->     [NonSerialized]
->     private string _mySecretBackingField;
->     public string MySecret
+>     [ThreadStatic]
+>     private string _threadStaticProperty;
+>     public string ThreadStaticProperty
 >     {
->         get { return _mySecretBackingField; }
->         set { _mySecretBackingField = value; }
+>         get { return _threadStaticProperty; }
+>         set { _threadStaticProperty = value; }
 >     }
 > }
 > ```