Change 'next-page'-link as topic is now called 'named-arguments'

Author: Philippus

tutorials/tour/_posts/2017-02-13-default-parameter-values.md

@@ -7,7 +7,7 @@ disqus: true
 tutorial: scala-tour
 categories: tour
 num: 33
-next-page: named-parameters
+next-page: named-arguments
 previous-page: annotations
 prerequisite-knowledge: named-arguments, function syntax
 ---