fix numbers js code example

Example 1: tofixed currency in js

(12345.67).toFixed(2).replace(/\d(?=(\d{3})+\.)/g, '$&,');  // 12,345.67

Example 2: js toFixed

var a = 3.3445;
var c = a.toFixed(1); console.log(c); /* result ->*/ 3.3
var g = a.toFixed(4); console.log(g); /* result ->*/ 3.3445
var g = a.toFixed(7); console.log(g); /* result ->*/ 3.3445000
 //               ^                                    ^^^^^^^
/*Syntax ->*/ number.toFixed([digits])
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