Update rules-of-workflows.mdx

Fixed wrong argument passed to the create fn

Author: RielJ

src/content/docs/workflows/build/rules-of-workflows.mdx

@@ -310,7 +310,7 @@ export default {
     instanceId = `${getUserId(request)}-${await crypto.randomUUID().slice(0, 6)}`
     let { result } = await addNewInstanceToDB(userId, instanceId)
     let goodInstance = await env.MY_WORKFLOW.create({
-    	id: userId,
+    	id: instanceId,
     	params: payload
     });