Update README.md

Author: alesanchezr

exercises/05.3-Add-items-to-array/README.md

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+tutorial: https://www.youtube.com/watch?v=no9mCu-tvaM
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 # `05.3` Add Items to Array
 
 Add 2 random integers to the "arr" list (no need to loop) and print the array on the console
 
 ## 💡 Tips:
 
 - You can use the Math.random() and Math.floor() functions to get random numbers, you should do that inside the loop
-- You have to use the `.push(item)` function to add the new random number to the array.
+- You have to use the `.push(item)` function to add the new random number to the array.