message: Docs: adding options _id
diff: @@ -236,6 +236,15 @@ nickName?: string;
  nickName?: string;
  ```
  + - `_id`: When false, no \_id is added to the subdocument
  +
  + ```typescript
  + class Car extends Typegoose {}
  +
  + @prop({ _id: false })
  + car?: Car;
  + ```
  +
  - `ref`: By adding the `ref` option with another Typegoose class as value, a Mongoose reference property will be created. The type of the property on the Typegoose extending class should be `Ref<T>` (see Types section).
  ```typescript
  