Adding new property formatterJSON for new schema (SharePoint#4641)

New Schema included formatterJSON property for views.  Adding new property to documentation.

Author: bcameron1231

docs/declarative-customization/site-design-json-schema.md

@@ -225,7 +225,7 @@ Defines and adds a view to the list. Use this action to specify the desired colu
 - **isPaged** – Specifies whether the view is paged.
 - **makeDefault** – If **true**, the view will be made the default for the list; otherwise, **false**.
 - **scope** – An optional setting to specify the scope of the view. For more details, see [SPViewScope enumeration](https://msdn.microsoft.com/en-us/library/microsoft.sharepoint.spviewscope.aspx).
-
+- **formatterJSON** – An optional settings to specify the JSON formatting for the view
 #### Example
 
 ```json