docs: add TrueProxies to Puppeteer proxy list

Author: trueproxies

docs/guides/examples/puppeteer.mdx

@@ -216,3 +216,4 @@ Here are a list of proxy services we recommend:
 - [Oxylabs](https://oxylabs.io/)
 - [ScrapingBee](https://scrapingbee.com/)
 - [Smartproxy](https://smartproxy.com/)
+- [TrueProxies](https://trueproxies.com/)