add commercial blog post link

docs/en/Blog-Posts/2021-03-31 v4_3 Preview/POST.md

@@ -14,7 +14,7 @@ Besides the new features above, we've done many performance improvements, enhanc
 
 This version was a big development journey for us; [~160 issues](https://github.com/abpframework/abp/issues?q=is%3Aissue+milestone%3A4.3-preview+is%3Aclosed) resolved, [~300 PRs](https://github.com/abpframework/abp/issues?q=is%3Apr+milestone%3A4.3-preview+is%3Aclosed) merged and **~1,700 commits** done only in the [main framework repository](https://github.com/abpframework/abp). **Thanks to the ABP Framework team and all the contributors.**
 
-> ABP Commercial 4.3 RC has also been published. We will write a separate blog post for it.
+> ABP Commercial 4.3 RC has also been published. Check out [the commercial blog post](https://blog.abp.io/abp/ABP-Commercial-4.3-RC-Has-Been-Published).
 
 ## The Migration Guide