Link TwP docs

Author: markushi

develop-docs/sdk/data-model/event-payloads/contexts.mdx

@@ -628,7 +628,7 @@ Additional information that allows Sentry to connect multiple transactions, span
 
 `span_id`
 
-: _Required_. The ID of the span or transaction. If there's none available (e.g. in tracing without performance mode), a random span ID must be provided.
+: _Required_. The ID of the span or transaction. If there's none available (e.g. in tracing without performance mode), a random span ID must be provided. [See the TwP docs](/sdk/telemetry/traces/tracing-without-performance/#attaching-trace-data-to-events-and-envelopes) for more details.
 
 - Example: `"bb8f278130535c3c"`