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/CSVToJSON.md

@@ -3,9 +3,9 @@
 Converts a comma-separated values (CSV) string to a 2D array of objects.
 The first row of the string is used as the title row.
 
-Use `Array.slice()` and `Array.indexOf('\n')` and `String.split(delimiter)` to separate the first row (title row) into values.
-Use `String.split('\n')` to create a string for each row, then `Array.map()` and `String.split(delimiter)` to separate the values in each row.
-Use `Array.reduce()` to create an object for each row's values, with the keys parsed from the title row.
+Use `Array.prototype.slice()` and `Array.prototype.indexOf('\n')` and `String.prototype.split(delimiter)` to separate the first row (title row) into values.
+Use `String.prototype.split('\n')` to create a string for each row, then `Array.prototype.map()` and `String.prototype.split(delimiter)` to separate the values in each row.
+Use `Array.prototype.reduce()` to create an object for each row's values, with the keys parsed from the title row.
 Omit the second argument, `delimiter`, to use a default delimiter of `,`.
 
 ```js