Add the text "x = true; console.log(type of x) // boolean ``` From t… (#26111)

* Add the text "x = true; console.log(type of x) // boolean ```  From the last example above, The `typeof` operator returns a boolean that represents the current type of a variable; x which is of value `true`."

* Revert extra sentence

guide/english/javascript/typeof/index.md

@@ -25,6 +25,8 @@ x = 'string';
 console.log(typeof x) // string
 x = { key: 'value' };
 console.log(typeof x) // object
+x = true;
+console.log(type of x) // boolean
 ```
 
 This can be useful for checking the type of a variable in a function and continuing as appropriate.