Replay SDK: document beforeAddRecordingEvent #7055
Description
The SDK received a new callback that allows users to modify (including scrub data) on the Replay Recording Event (rrweb).
This can be documented in the Privacy page. As an additional tool for developers to remove or modify data before it leaves the browser. For example, removing some breadcrumbs or network calls captured. See: getsentry/sentry-javascript#8124
Additionally, using URL scrubbing as an example, we can also mention a best-effort scrubbing in URLs happens in Sentry Relay (before data hits any storage). See: getsentry/relay#2143