message: Add documentation for "getClassForDocument"
  getClassForDocument(gh-page): change documentation for the actual function
diff: @@ -4,7 +4,9 @@ redirect_from:
  - /docs/functions/getmodelforclass
  ---
  -`getModelForClass` is used to get a model for a given class and if its the first time, generate a model
  +`getClassForDocument(doc: DocumentType<any>)` is used to get the Class used in the model creation
  +
  +Note: only works if the class / model were created with typegoose OR added with [`addModelToTypegoose`]({{ site.baseurl }}{% link _docs/functions/addModelToTypegoose.md%})
  ## Example
  @@ -13,4 +15,10 @@ class Kitten {
  @prop()
  public name?: string;
  }
  +
  +const model = getModelForClass(Kitten);
  +
  +const doc = new model();
  +
  +getClassForDocument(doc) === Kitten // should be "true"
  ```
  