update the advanced part

websitev2/docs/advanced/api_access.md

@@ -17,11 +17,10 @@ Please note that it may take up to 60 seconds for the new key to propagate to al
 
 Now that you have an access token with admin privileges we can use that to perform changes in our Unleash instance.
 
-In the example below we will use the [Unleash Admin API](../api/admin/features) to enable the “Demo” feature toggle sing curl.
+In the example below we will use the [Unleash Admin API](../api/admin/features) to enable the “Demo” feature toggle using curl.
 
 ```sh
-curl -X POST -H "Authorization: admintoken"
-https://app.unleash-hosted.com/demo/api/admin/features/Demo/toggle/on
+curl -X POST -H "Content-Type: application/json" -H "Authorization: admintoken" https://app.unleash-hosted.com/demo/api/admin/features/Demo/toggle/on
 ```
 
 **Great success!** We have now enabled the feature toggle. We can also verify that it was actually changed by the API user by navigating to the history (audit log) for this feature toggle.