Patch 10 (SharePoint#5567)

* Added `group` for the createContentType action

The `group` property is included in result from the getSiteScriptFromList api.

* Added group in example

Author: ypcode

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

@@ -529,6 +529,7 @@ Use **createContentType** to define a new content type that can then be associat
 - `parentId`: ID of the parent content type.
 - `id`: ID of the content type.
 - `hidden`: Specifies whether the content type is visible or hidden.
+- `group`: Group of the content type.
 - `subactions`: Specifies subactions to run on the content type. These are used to designate the site columns to add.
 
 #### Example
@@ -540,6 +541,7 @@ Use **createContentType** to define a new content type that can then be associat
   "description": "custom list content type",
   "parentName": "Item",
   "hidden": false,
+  "group": "Contoso",
   "subactions":
     [
       {