Update an entry in readme.txt to match changelog.txt (#4526)

Author: malithsen

readme.txt

@@ -115,7 +115,7 @@ If you get stuck, you can ask for help in the [Plugin Forum](https://wordpress.o
 * Tweak - Check for checkout validation error before creating a payment method in Stripe
 * Fix - Prevent multiple save appearance AJAX calls on Block Checkout
 * Fix - Fix required field error message and PHP warning for custom checkout fields that don't have a label
-* Fix - Fix fatal when processing Boleto setup intents via webhooks
+* Fix - Fix fatal when processing setup intents for free subscriptions via webhooks
 * Dev - Fix WooCommerce version fetching in GitHub workflows
 * Dev - Fix failing test cases associated with WooCommerce 10.0.x