Update testing notes

Author: nielslange

docs/internal-developers/testing/releases/1092.md

@@ -39,9 +39,9 @@ Zip file for testing: [woocommerce-gutenberg-products-block.zip](https://github.
 
 #### Checkout templates: Fix endpoint and page sync logic. [#10640](https://github.com/woocommerce/woocommerce-blocks/pull/10640)
 
-1. With a Block theme activated, go to WooCommerce > Settings > Advanced
-2. Edit the checkout permalink and choose a slug that matches an existing page
-3. Save the changes
+1. With a Block theme activated, go to WooCommerce > Settings > Advanced.
+2. Edit the checkout permalink and choose a slug that matches an existing page which is not a subpage of another page.
+3. Save the changes.
 4. Go to Admin > Pages and find the page you chose in the list. It should be marked as being the WooCommerce Checkout Page.
 
 ## Should be tested by the development team exclusively