Updated API from documentation release

Author: ct-sdks[bot]

api-specs/history/types/ModifiedBy.raml

@@ -6,12 +6,16 @@ example: !include ../examples/ModifiedBy.json
 description: |
   Information about the user or API Client who performed the change. This is a variant of [LastModifiedBy](ctp:api:type:LastModifiedBy).
 properties:
-  id:
+  isPlatformClient:
+    type: boolean
+    description: |
+      `true` if the change was made using the Merchant Center or [ImpEx](https://impex.europe-west1.gcp.commercetools.com/).
+  id?:
     type: string
     description: |
       [ID](/general-concepts#identifier) of the Merchant Center user who made the change.
 
-      Present only if the change was made in the Merchant Center.
+      Present only if `isPlatformClient` is `true`.
   type:
     type: string
     description: |
@@ -40,7 +44,3 @@ properties:
     type: Reference
     description: |
       The [Associate](ctp:api:type:Associate) who made the change in the context of a [Business Unit](ctp:api:type:BusinessUnit). Present only if the Associate acts on behalf of a company using the [associate endpoints](/associates-overview#on-the-associate-endpoints).
-  isPlatformClient:
-    type: boolean
-    description: |
-      `true` if the change was made using the Merchant Center or [ImpEx](https://impex.europe-west1.gcp.commercetools.com/).