message: Update decorators(gh-page)
  decorators(gh-page): mention deprecation of "arrayProp" and "mapProp"
  decorators(gh-page): add missing "@queryMethod" decorator mention
  closes typegoose/typegoose#301
diff: @@ -6,15 +6,16 @@ This Guide shows all the decorators that can be used for / in a class
  ## All Decorators
  -- All in-Class decorators:
  +- All Property decorators:
  - [`@prop`]({{ site.baseurl }}{% link _docs/decorators/prop.md %}) is the most important decorator, because it defines values(\|keys) that are then in the model & document
  - - [`@arrayProp`]({{ site.baseurl }}{% link _docs/decorators/arrayProp.md %}) is the second most important decorator, it is the same as `@prop`, just for arrays
  - - [`@mapProp`]({{ site.baseurl }}{% link _docs/decorators/mapProp.md %}) is for a Map<string, T>
  + - [`@arrayProp`]({{ site.baseurl }}{% link _docs/decorators/arrayProp.md %}) it is the same as `@prop`, just for arrays **[Deprecated]**
  + - [`@mapProp`]({{ site.baseurl }}{% link _docs/decorators/mapProp.md %}) is for a Map<string, T> **[Deprecated]**
  <!--This is just a separator-->
  -- All out-Class decorators:
  +- All Class decorators:
  - [`@modelOptions`]({{ site.baseurl }}{% link _docs/decorators/modelOptions.md %}), used for Schema Options, an existing Mongoose and an existing Connection
  - [`@index`]({{ site.baseurl }}{% link _docs/decorators/indexes.md %}) is for indexes, that are **NOT** defined in the prop (mainly for compound indexes)
  - [`@plugin`]({{ site.baseurl }}{% link _docs/decorators/plugins.md %}) is for adding plugins, please note that plugins cannot modify the types of prop, we are sorry for this
  + - [`@queryMethod`]({{ site.baseurl }}{% link _docs/decorators/queryMethod.md %}) is for adding query Methods
  - [Hooks]({{ site.baseurl }}{% link _docs/decorators/hooks.md %}):
  - `@pre` is for Pre-Hooks
  - `@post` is for Post-Hooks
  