chore(docs): Updated API Reference (v2) (#9148)

Automated changes by [create-pull-request](https://github.com/peter-evans/create-pull-request) GitHub action

Co-authored-by: Oli Juhl <59018053+olivermrbl@users.noreply.github.com>

www/apps/api-reference/specs/admin/components/schemas/AdminCreateCustomerGroup.yaml

@@ -1,5 +1,5 @@
 type: object
-description: SUMMARY
+description: The customer group's details.
 x-schemaName: AdminCreateCustomerGroup
 required:
   - name
@@ -10,4 +10,4 @@ properties:
     description: The customer group's name.
   metadata:
     type: object
-    description: The customer group's metadata.
+    description: The customer group's metadata, used to store custom key-value pairs.