docs: update how-it-works.md
docs: update how-it-works.md

Fixed link to Using the API
amitkumarmahajan/videogular2,kwarismian/videogular2,amitkumarmahajan/videogular2,videogular/videogular2,amitkumarmahajan/videogular2,videogular/videogular2,videogular/videogular2,kwarismian/videogular2,kwarismian/videogular2