Fixes a typo in the Suit test style block

Fix `feautre` typo in test style block

Status: **Opened for visibility**
Reviewers: **@kennethormandy**

## Changes
- Change all instances of `feautre` with `feature` in the test style block. Seems like this was a typo generated through some copy-pasting when creating the `-webkit-` prefix. (Great argument for Autoprefixer)