update config for IPs for v3

content/3.features/ip-pools.md

@@ -11,7 +11,7 @@ Postal supports sending messages from different IP addresses. This allows you to
 By default, IP pools are disabled and all email is sent from any IP address on the host running the workers. To use IP pools, you'll need to enable them in the configuration file. You can do this by setting the following in your `postal.yml` configuration file. You'll then need to restart Postal using `postal stop` and `postal start`.
 
 ```yaml
-general:
+postal:
   use_ip_pools: true
 ```
 
@@ -25,4 +25,4 @@ Once allocated to an organization, you can assign the IP pool to servers from th
 
 ::callout{icon="i-heroicons-exclamation-triangle" color="amber"}
 It's <b>very important</b> to make sure that the IP addresses you add in the web interface are actually configured on your Postal servers. If the IPs don't exist on the server, message delivery may fail or messages will not be dequeued correctly.
-::
+::