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_archive/solveRPN.md

@@ -4,8 +4,8 @@ Solves the given mathematical expression in [reverse polish notation](https://en
 Throws appropriate errors if there are unrecognized symbols or the expression is wrong. The valid operators are :- `+`,`-`,`*`,`/`,`^`,`**` (`^`&`**` are the exponential symbols and are same). This snippet does not supports any unary operators.
 
 Use a dictionary, `OPERATORS` to specify each operator's matching mathematical operation.
-Use `String.replace()` with a regular expression to replace `^` with `**`, `String.split()` to tokenize the string and `Array.filter()` to remove empty tokens.
-Use `Array.forEach()` to parse each `symbol`, evaluate it as a numeric value or operator and solve the mathematical expression.
+Use `String.prototype.replace()` with a regular expression to replace `^` with `**`, `String.prototype.split()` to tokenize the string and `Array.prototype.filter()` to remove empty tokens.
+Use `Array.prototype.forEach()` to parse each `symbol`, evaluate it as a numeric value or operator and solve the mathematical expression.
 Numeric values are converted to floating point numbers and pushed to a `stack`, while operators are evaluated using the `OPERATORS` dictionary and pop elements from the `stack` to apply operations.
 
 ```js