Typo in checklist > controls

Created by: PhilipKrook

Finding the issue

How to get to the issue:

1. Turn on Chrome
2. Go to a11yproject.com
3. Navigate to "checklist" then to "Controls" and click the ":focus" dropdown

Actual result

There is a typo on line 2: "Visible focus styles help people determine wihch interactive element has"

Additional Information

To help us try and reproduce the issue, please provide the following information:

1. Using laptop
2. Windows 10
3. Chrome

Thank you all for a great and very helpful site!