add link to PPR docs

Author: TC-MO

sources/platform/actors/publishing/monetize/pay_per_event.mdx

@@ -12,7 +12,7 @@ sidebar_position: 1
 import Tabs from '@theme/Tabs';
 import TabItem from '@theme/TabItem';
 
-The PPE pricing model offers a flexible monetization option for Actors on Apify Store. Unlike pay per result, PPE allows you to charge users based on specific events triggered programmatically by your Actor's code.
+The PPE pricing model offers a flexible monetization option for Actors on Apify Store. Unlike [pay per result](/platform/actors/publishing/monetize/pay-per-result), PPE allows you to charge users based on specific events triggered programmatically by your Actor's code.
 
 PPE lets you define pricing for individual events. You can charge for specific events directly from your Actor using the [JS](/sdk/js/reference/class/Actor#charge)/[Python](/sdk/python/reference/class/Actor#charge) SDK, or by calling the [PPE charging API](/api/v2/post-charge-run) directly. Common events include Actor start, dataset item creation, and external API calls.