Update README.md

Author: josemoracard

exercises/10-Array-Methods/README.md

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 tutorial: "https://www.youtube.com/watch?v=jBXve_vh7dU"
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 # `10` List Methods
 
 ## 📝 Instructions:
 
 1. Write a function called `sort_names` that, given a list of names, returns them in alphabetical order.
 
-## 💡 Hint
+## 💡 Hints:
 
-+ Every list comes with default functions that allows sorting- use it inside your function!
++ Every list comes with default functions that allow sorting - use it inside your function!
 
 + Stuck on sorting? Read W3 Schools page on sorting lists: