Add example of arrow function with no brackets (#23557)

* Add example of arrow function with no brackets

Add an example of the shorter option of an arrow function

* Fixed typo

guide/english/javascript/es6/arrow-functions/index.md

@@ -47,6 +47,14 @@ let newOneWithOneParam = a => {
 }
 ```
 
+When there is only one statement or operation in the function body, braces are optional and the result is returned or undefined.
+
+```javascript
+let a = 10;
+let newOneParamWithNoBrackets = b => a + b;
+console.log(newOneParamWithNoBrackets(20)); // 30
+```
+
 An incredible advantage of the arrows function is that you can not rebind an arrow function. It will always be called with the context in which it was defined. Just use a normal function.
 ```javascript
 // Old Syntax