Add prototype to descriptions

snippets/countWeekDaysBetween.md

@@ -7,7 +7,7 @@ Counts the weekdays between two dates.
 
 - Use `Array.from()` to construct an array with `length` equal to the number of days between `startDate` and `endDate`.
 - Use `Array.prototype.reduce()` to iterate over the array, checking if each date is a weekday and incrementing `count`.
-- Update `startDate` with the next day each loop using `Date.getDate()` and `Date.setDate()` to advance it by one day.
+- Update `startDate` with the next day each loop using `Date.prototype.getDate()` and `Date.prototype.setDate()` to advance it by one day.
 - **NOTE:** Does not take official holidays into account.
 
 ```js