add link for intersection observer api

docs/app/routes/docs/utilities/use-in-view.mdx

@@ -14,7 +14,7 @@ isNew: true
 
 # useInView
 
-A helpful utility hook tracking the visibility of an element in the viewport. Using the native `IntersectionObserver`,
+A helpful utility hook tracking the visibility of an element in the viewport. Using the native [`IntersectionObserver`](https://developer.mozilla.org/en-US/docs/Web/API/Intersection_Observer_API),
 you can respond either to a `boolean` signifying that the element has "intersected" or instead pass it a function
 returning `SpringValues` to animate the element upon `intersection`.