content: add a link to previous exercise in methods/25
Added a link to methods/25 to moretypes/18 because they are related.
This improves the usability of the page.
Reviewed-by: Alberto Donizetti <firstname.lastname@example.org>
diff --git a/content/methods.article b/content/methods.article
index 7475369..5ad5cc8 100644
@@ -403,7 +403,7 @@
* Exercise: Images
-Remember the picture generator you wrote earlier? Let's write another one, but this time it will return an implementation of `image.Image` instead of a slice of data.
+Remember the [[/moretypes/18][picture generator]] you wrote earlier? Let's write another one, but this time it will return an implementation of `image.Image` instead of a slice of data.
Define your own `Image` type, implement [[https://golang.org/pkg/image/#Image][the necessary methods]], and call `pic.ShowImage`.