Improvements to enabling Sentry docs

doc/operations/error_tracking.md

@@ -41,8 +41,10 @@ least Maintainer [permissions](../user/permissions.md) to enable the Sentry inte
 
 1. Sign up to Sentry.io or [deploy your own](#deploying-sentry) Sentry instance.
 1. [Create](https://docs.sentry.io/product/sentry-basics/guides/integrate-frontend/create-new-project/) a new Sentry project. For each GitLab project that you want to integrate, we recommend that you create a new Sentry project.
-1. [Find or generate](https://docs.sentry.io/api/auth/) a Sentry auth token for your Sentry project.
-   Make sure to give the token at least the following scopes: `event:read`, `project:read`, and `event:write` (for resolving events).
+1. Find or generate a [Sentry auth token](https://docs.sentry.io/api/auth/#auth-tokens).
+   For the SaaS version of Sentry, you can find or generate the auth token at [https://sentry.io/api/](https://sentry.io/api/).
+   Make sure to give the token at least the following scopes: `project:read`, `event:read`, and
+   `event:write` (for resolving events).
 1. In GitLab, enable error tracking:
    1. On the top bar, select **Menu > Projects** and find your project.
    1. On the left sidebar, select **Monitor > Error Tracking**.