message: docs(queryMethod): update code example to include imports
  fixes typegoose/typegoose#639
diff: @@ -18,11 +18,13 @@ It is recommended to not define the functions inside the decorator, like in the
  Example:
  ```ts
  +import { types } from "@typegoose/typegoose";
  +
  // an interface is needed to add query-function types to the class
  interface QueryHelpers {
  // use the actual function types dynamically
  - findByName: AsQueryMethod<typeof findByName>;
  - findByLastname: AsQueryMethod<typeof findByLastname>;
  + findByName: types.AsQueryMethod<typeof findByName>;
  + findByLastname: types.AsQueryMethod<typeof findByLastname>;
  }
  function findByName(this: ReturnModelType<typeof Person, QueryHelpers>, name: string) {
  