Update README.md

Author: alesanchezr

exercises/03.2-Retrieve-Items/README.md

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+tutorial: https://www.youtube.com/watch?v=rWYIgofIAME
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 # `03.2` Retrieve Items
 
 The only way of accessing a particular element in an array is using an index. An index is an integer number that represents the position you want to access in the array.
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 # 📝 Instructions
 
 1. Print on the console the 1st element of the array
-2. Print on the console the 4th element of the array
+2. Print on the console the 4th element of the array