Avoid confusing prototype methods for static methods

Correct: `Array.from()` (it’s a static method)
Incorrect: `Array.join()` (doesn’t exist; it’s a prototype method)

This patch uses the common `#` syntax to denote `.prototype.`.

snippets/stableSort.md

@@ -1,11 +1,11 @@
 ### stableSort
 
-Performs stable sorting of an array, preserving the initial indexes of items when their values are the same. 
+Performs stable sorting of an array, preserving the initial indexes of items when their values are the same.
 Does not mutate the original array, but returns a new array instead.
 
-Use `Array.map()` to pair each element of the input array with its corresponding index. 
-Use `Array.sort()` and a `compare` function to sort the list, preserving their initial order if the items compared are equal.
-Use `Array.map()` to convert back to the initial array items.
+Use `Array.prototype.map()` to pair each element of the input array with its corresponding index.
+Use `Array.prototype.sort()` and a `compare` function to sort the list, preserving their initial order if the items compared are equal.
+Use `Array.prototype.map()` to convert back to the initial array items.
 
 ```js
 const stableSort = (arr, compare) =>