Update README.md

[BirdboyBolu]

Hello Damilola, I noticed that the link to the "11 Best Practices for Writing API Documentation" was wrong, as it kept returning a 404 error response. I replaced it with the correct link. It should work perfectly now. I also added one useful article to the list. Kindly review.

[dharmelolar]

@BirdboyBolu Thanks for your contribution!