Small fix

Author: sofietoft

13/umbraco-commerce/release-notes/README.md

@@ -18,7 +18,7 @@ If you are upgrading to a new major version, check the breaking changes in the [
 This section contains the release notes for Umbraco Commerce 13 including all changes for this version.
 
 #### [13.1.8](https://github.com/umbraco/Umbraco.Commerce.Issues/issues?q=is%3Aissue+is%3Aclosed+label%3Arelease%2F13.1.8) (October 17th 2024)
-* Belt and brace the entity cache and added a logger to log if an attempt is made to set a NULL key [#565](https://github.com/umbraco/Umbraco.Commerce.Issues/issues/565).
+* Belt and brace the entity cache and added a logger to log if an attempt is made to set a `NULL` key [#565](https://github.com/umbraco/Umbraco.Commerce.Issues/issues/565).
 
 #### [13.1.7](https://github.com/umbraco/Umbraco.Commerce.Issues/issues?q=is%3Aissue+is%3Aclosed+label%3Arelease%2F13.1.7) (October 10th 2024)
 * Fixed issue where the EntityCache fail after the .NET Software Development Kit (SDK) update [#565](https://github.com/umbraco/Umbraco.Commerce.Issues/issues/565).