update desugar docs

Author: bishabosha

docs/docs/reference/enums/desugarEnums.md

@@ -174,14 +174,15 @@ Companion objects of enumerations that contain at least one simple case define i
      follows.
      ```scala
      private def $new(_$ordinal: Int, $name: String) = new E {
-       def $ordinal = $_ordinal
-       override def toString = $name
+       def ordinal = _$ordinal       // if `E` does not have `java.lang.Enum` as a parent
+       override def toString = $name // if `E` does not have `java.lang.Enum` as a parent
        $values.register(this) // register enum value so that `valueOf` and `values` can return it.
      }
      ```
 
 The anonymous class also implements the abstract `Product` methods that it inherits from `Enum`.
-The `$ordinal` method above is used to generate the `ordinal` method if the enum does not extend a `java.lang.Enum` (as Scala enums do not extend `java.lang.Enum`s unless explicitly specified). In case it does, there is no need to generate `ordinal` as `java.lang.Enum` defines it.
+The `ordinal` method is only generated if the enum does not extend from `java.lang.Enum` (as Scala enums do not extend `java.lang.Enum`s unless explicitly specified). In case it does, there is no need to generate `ordinal` as `java.lang.Enum` defines it. Similarly there is no need to override `toString` as that is defined in terms of `$name` in
+`java.lang.Enum`.
 
 ### Scopes for Enum Cases