Update cognitive complexity link (#443)

Author: ilia-kebets-sonarsource

docs/rules/cognitive-complexity.md

@@ -4,7 +4,7 @@ Cognitive Complexity is a measure of how hard the control flow of a function is
 
 ## See
 
-- [Cognitive Complexity](http://redirect.sonarsource.com/doc/cognitive-complexity.html)
+- [Cognitive Complexity](https://www.sonarsource.com/resources/cognitive-complexity/)
 
 ## Configuration