Apply suggestion from @Moohan

Author: Moohan

NEWS.md

@@ -51,7 +51,7 @@ multiplication, division, rounding, summary statistics, etc. The more
 traditional workflow would require a lot more effort to do these same
 operations.
 
-The vignette for `percent` functions has also been written for users to view.
+A [percent vignette](https://public-health-scotland.github.io/phsmethods/articles/percent.html) has been created to help introduce and explain this new feature.
 
 ## Lifecycle changes