docs(readme): edit description of the PageVitals tool (#15395)

readme.md

@@ -338,7 +338,7 @@ This section details services that have integrated Lighthouse data. If you're wo
 
 * **[Treo](https://treo.sh)** - Treo is Lighthouse as a Service. It provides regression testing, geographical regions, custom networks, and integrations with GitHub & Slack. Treo is a paid product with plans for solo-developers and teams.
 
-* **[PageVitals](https://pagevitals.com)** - PageVitals combines Lighthouse, CrUX and real-user monitoring data to monitor the performance of websites. See how your website performs over time and get alerted if it gets too slow. Drill down and find the real cause of any performance issue. PageVitals is a paid product with a free 14-day trial.
+* **[PageVitals](https://pagevitals.com)** - PageVitals combines Lighthouse, CrUX and field testing to monitor the performance of websites. See how your website performs over time and get alerted if it gets too slow. Drill down and find the real cause of any performance issue. PageVitals is a paid product with a free 14-day trial.
 
 * **[Alertdesk](https://www.alertdesk.com/)** - Alertdesk is based on Lighthouse and helps you to keep track of your site’s quality & performance. Run daily quality & performance tests from both Mobile and Desktop and dive into the powerful & intuitive reports. You can also monitor your uptime (every minute - 24/7) & domain health. Alertdesk is a paid product with a free 14-day trial.