Update sentry.md

Author: soyeric128

docs/doc/13-monitor/sentry.md

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 title: Sentry
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-[Sentry](sentry.io) is a developer-first error tracking and performance monitoring platform that helps developers see what actually matters, solve quicker, and learn continuously about their applications.
+[Sentry](https://sentry.io/welcome/) is a developer-first error tracking and performance monitoring platform that helps developers see what actually matters, solve quicker, and learn continuously about their applications.
 
 Databend provides integration with both Cloud and self-hosted Sentry solutions. The following tutorial walks you through the integration process.