Fix typing mistakes and broken links

[dblana]

This is a great place to start if you're looking to contribute via GitHub for the first time.

If you see a typing mistake or a broken link anywhere in our documentation you can fix by making a pull request.

This is one of our "good first bugs" and therefore you don't have to have any experience with GitHub to complete it. Just comment below with the mistake that you've found, and @dblana will be sure to help you all the way along to merging in your the new - correct - version of the text.

You can contact Dimitra by typing @dblana in your comment below.

Go for it! And thank you!