renamed attachment's parentId to more fitting ownerId

test-etapi/put-attachment-content-binary.http

@@ -18,7 +18,7 @@ Authorization: {{authToken}}
 Content-Type: application/json
 
 {
-  "parentId": "{{createdNoteId}}",
+  "ownerId": "{{createdNoteId}}",
   "role": "file",
   "mime": "text/plain",
   "title": "my attachment",
@@ -36,4 +36,4 @@ Content-Transfer-Encoding: binary
 
 < ../images/icon-color.png
 
-> {% client.assert(response.status === 204); %}
+> {% client.assert(response.status === 204); %}