message: docs(isRefType): fix array example
diff: @@ -39,7 +39,7 @@ class Cat {
  public kittens: Ref<Cat>;
  public areAllKittensExisting(): boolean {
  - if (isDocumentArray(this.kittens)) {
  + if (isRefTypeArray(this.kittens)) {
  // "this.kittens" now has the type of "Cat._id"'s RefType (This case ObjectId)
  return true;
  } else {
  