Apply new format to snippets and template

snippets/averageBy.md

@@ -5,7 +5,7 @@ tags: math,array,function,intermediate
 
 Returns the average of an array, after mapping each element to a value using the provided function.
 
-Use `Array.prototype.map()` to map each element to the value returned by `fn`, `Array.prototype.reduce()` to add each value to an accumulator, initialized with a value of `0`, divide by the `length` of the array.
+- Use `Array.prototype.map()` to map each element to the value returned by `fn`, `Array.prototype.reduce()` to add each value to an accumulator, initialized with a value of `0`, divide by the `length` of the array.
 
 ```js
 const averageBy = (arr, fn) =>
@@ -16,4 +16,4 @@ const averageBy = (arr, fn) =>
 ```js
 averageBy([{ n: 4 }, { n: 2 }, { n: 8 }, { n: 6 }], o => o.n); // 5
 averageBy([{ n: 4 }, { n: 2 }, { n: 8 }, { n: 6 }], 'n'); // 5
-```
+```