Update snippet descriptions

snippets/partitionBy.md

@@ -3,7 +3,7 @@ title: partitionBy
 tags: array,object,advanced
 ---
 
-Applies `fn` to each value in `arr`, splitting it each time `fn` returns a new value.
+Applies `fn` to each value in `arr`, splitting it each time the provided function returns a new value.
 
 - Use `Array.prototype.reduce()` with an accumulator object that will hold the resulting array and the last value returned from `fn`.
 - Use `Array.prototype.push()` to add each value in `arr` to the appropriate partition in the accumulator array.