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/CSVToArray.md

@@ -2,8 +2,8 @@
 
 Converts a comma-separated values (CSV) string to a 2D array.
 
-Use `Array.slice()` and `Array.indexOf('\n')` to remove the first row (title row) if `omitFirstRow` is `true`.
-Use `String.split('\n')` to create a string for each row, then `String.split(delimiter)` to separate the values in each row.
+Use `Array.prototype.slice()` and `Array.prototype.indexOf('\n')` to remove the first row (title row) if `omitFirstRow` is `true`.
+Use `String.prototype.split('\n')` to create a string for each row, then `String.prototype.split(delimiter)` to separate the values in each row.
 Omit the second argument, `delimiter`, to use a default delimiter of `,`.
 Omit the third argument, `omitFirstRow`, to include the first row (title row) of the CSV string.