Update area.yaml

Removes array indicator '-' from request body

Author: kgrunenberg

core/standard/openapi/paths/queries/area.yaml

@@ -39,7 +39,7 @@ post:
   parameters:
     $ref: ../../parameters/collections/collectionId.yaml  
   requestBody:
-    - $ref: ../../request-bodies/area.yaml  
+    $ref: ../../request-bodies/area.yaml  
   responses:
     200:
       $ref: ../../responses/queries/200.yaml