Snippet format update

To match the starter (for the migration)

snippets/elementIsVisibleInViewport.md

@@ -1,4 +1,7 @@
-### elementIsVisibleInViewport
+---
+title: elementIsVisibleInViewport
+tags: browser,advanced
+---
 
 Returns `true` if the element specified is visible in the viewport, `false` otherwise.
 
@@ -22,4 +25,4 @@ const elementIsVisibleInViewport = (el, partiallyVisible = false) => {
 // e.g. 100x100 viewport and a 10x10px element at position {top: -1, left: 0, bottom: 9, right: 10}
 elementIsVisibleInViewport(el); // false - (not fully visible)
 elementIsVisibleInViewport(el, true); // true - (partially visible)
-```
+```