message: docs(ref): update type documentation to actual type
diff: @@ -3,10 +3,14 @@ id: ref-type
  title: 'Ref'
  ---
  -The Type `Ref<T>` is the type used for [References](https://mongoosejs.com/docs/populate.html).
  +The Type `Ref<Class, IDType>` is the type used for [References](https://mongoosejs.com/docs/populate.html).
  +The `Class` generic-parameter is used to set the class that is being referenced.
  +The `IDType` generic-parameter is used to set the `_id` type of the referenced class (Default: `mongoose.Types.ObjectId`).
  There are [typeguards](api/functions/typeguards/isDocument.md) to check if a Reference is populated.
  +For an more written out guide, there is the [Reference Other Classes](../../guides/advanced/reference-other-classes.md) Guide.
  +
  ## Example
  ```ts
  