Link to docs for timing-allow-origin alert with examples

A user wrote asking for assistance with debugging their timing-allow-origin setup for their production CDN. We should link the warning banner in resource module and span details to a troubleshooting docs page with relevant examples.

See related user feedback: https://sentry.sentry.io/feedback/?feedbackSlug=javascript:4807361749&project=11276

https://github.com/getsentry/sentry/blob/341e1deb77f63d1323ddf7f2cc6b890bd514a9a0/static/app/views/performance/browser/resources/resourceSummaryPage/resourceInfo.tsx#L113

https://github.com/getsentry/sentry/blob/341e1deb77f63d1323ddf7f2cc6b890bd514a9a0/static/app/components/events/interfaces/spans/newTraceDetailsSpanDetails.tsx#L528