Improve testing notes format

Author: albarin

docs/internal-developers/testing/releases/891.md

@@ -4,9 +4,9 @@ Zip file for testing: [woocommerce-gutenberg-products-block.zip](https://github.
 
 ## Feature plugin and package inclusion in WooCommerce
 
--   Display correct block template when filtering by attribute. ([7640](https://github.com/woocommerce/woocommerce-blocks/pull/7640))
+### Display correct block template when filtering by attribute. ([7640](https://github.com/woocommerce/woocommerce-blocks/pull/7640))
 
-### Test that #7604 has been fixed
+#### Test that #7604 has been fixed
 
 1. Make sure you have a block theme active (like Twenty Twenty-Three).
 2. Add the “Filter by Attribute” block to the “Products by Category” template (in Appearance > Site Editor).
@@ -15,7 +15,7 @@ Zip file for testing: [woocommerce-gutenberg-products-block.zip](https://github.
 5. Verify the query params are added to the URL and the URL stays correct.
 6. Verify the loaded template is also correct (instead of rendering the “Product Catalog” template).
 
-### Test that there are no regressions with #6776
+#### Test that there are no regressions with #6776
 
 1. Make sure you have a block theme active (like Twenty Twenty-Three).
 2. Navigate to Products > Attributes and edit an existing one or create a new one.