[docs] "Edit this page" link is wrong

[gregfenton]

Describe the issue and the actual behavior

"Edit this page" link in published documentation is wrong. The link should direct us to edit the page, but it actually takes us to a Facebook GitHub page.

Describe the expected behavior

Takes us to a fork of the project and opens an editor on the particular page so that we can later submit a PR for the docs.

Provide steps to reproduce this issue

1. go to the main docs page
2. scroll to bottom of the page
3. click the Edit this page link

Please check the browsers where the issue is seen

• [x] Chrome
• [ ] Chrome (Android)
• [ ] Safari (OSX)
• [ ] Safari (iOS)
• [ ] Firefox
• [ ] Firefox (Android)