Wiki changes

FYI: The following changes were made to this repository's wiki:

- Restricting write access to contributors is strongly encouraged.  Please [make that change](https://github.com/mozilla/data-review/settings)  ([documentation](https://help.github.com/articles/changing-access-permissions-for-wikis/)).

These were made as the result of a recent automated defacement of publically writeable wikis.