Apply new format to snippets and template

snippets/longestItem.md

@@ -7,7 +7,7 @@ Takes any number of iterable objects or objects with a `length` property and ret
 If multiple objects have the same length, the first one will be returned.
 Returns `undefined` if no arguments are provided.
 
-Use `Array.prototype.reduce()`, comparing the `length` of objects to find the longest one.
+- Use `Array.prototype.reduce()`, comparing the `length` of objects to find the longest one.
 
 ```js
 const longestItem = (...vals) => vals.reduce((a, x) => (x.length > a.length ? x : a));