Clarify wording and don't repeat the same words over and over

Author: nul800sebastiaan

contributing/hacktoberfest/contributing.md

@@ -6,7 +6,7 @@ Specificially for Hacktoberfest, we have a lot more things you can get involved
 
 ## Umbraco 15 release candidate testing
 
-One of our main focus areas for 2024 is to deeply test out the major new features of Umbraco v15. The [release candidate for this release is available now](https://umbraco.com/blog/umbraco-15-release-candidate/) and we encourage you to test the main new features, namely:
+One of our main focus areas for 2024 is to deeply test out the major new features of Umbraco v15. The [release candidate for the upcoming Umbraco v15 is available now](https://umbraco.com/blog/umbraco-15-release-candidate/) and we encourage you to test the main new features, namely:
 
 - The new rich text editor (RTE)
   - Migrating existing RTEs to the new RTE datatype