Update CONTRIBUTING.md

Co-authored-by: pwseg <[email protected]>

Author: cmastr

CONTRIBUTING.md

@@ -81,7 +81,7 @@ Content with in each `.md` file is markdown. For information about styling, and
 
 Netlify allows you to build a preview environment on any PR you create in GitHub. This is helpful when you want to send out a review, and the formatting and design are important to those reviewers. 
 
-To build a preview site, add `netlify-build` to a commit message on your PR. Here's an example of what the preview build will look like: 
+To build a preview site, add `[netlify-build]` to a commit message on your PR. Here's an example of what the preview build will look like: 
 
 https://github.com/segmentio/segment-docs/pull/6051#issuecomment-1942723573