Merge pull request #18608 from vector-im/sentry-config

Documentation for sentry config

docs/config.md

@@ -139,6 +139,9 @@ For a good example, see https://develop.element.io/config.json.
 1. `posthog`: [Posthog](https://posthog.com/) integration config. If not set, Posthog analytics are disabled.
    1. `projectApiKey`: The Posthog project API key
    2. `apiHost`: The Posthog API host
+1. `sentry`: [Sentry](https://sentry.io/) configuration for rageshake data being sent to sentry.
+   1. `dsn`: the Sentry [DSN](https://docs.sentry.io/product/sentry-basics/dsn-explainer/)
+   2. `environment`: (optional) The [Environment](https://docs.sentry.io/product/sentry-basics/environments/) to pass to sentry
 
 Note that `index.html` also has an og:image meta tag that is set to an image
 hosted on riot.im. This is the image used if links to your copy of Element