Update 20_day_writing_clean_codes.md

Some spelling errors

20_Day_Writing_clean_codes/20_day_writing_clean_codes.md

@@ -180,11 +180,11 @@ const showDateTime = () => {
 }
 ```
 
-The `new Dat().toLocaleString()` can also be used to display current date time. The `toLocaleString()` methods takes different arguments. You may learn more about date and time from this [link](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date/toLocaleString).
+The `new Date().toLocaleString()` can also be used to display current date time. The `toLocaleString()` methods takes different arguments. You may learn more about date and time from this [link](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date/toLocaleString).
 
 #### Loops
 
-We coverer many types of loops in this challenges. The regular for loop, while loop, do while loop, for of loop, forEach loop and for in loop.
+We covered many types of loops in this challenges. The regular for loop, while loop, do while loop, for of loop, forEach loop and for in loop.
 Lets see how we use them:
 
 ```js