Add Relay - SDK context (#12772)

Author: cleptric

develop-docs/sdk/processes/basics.mdx

@@ -32,13 +32,17 @@ When sending events just substitute `orgXXX.ingest.sentry.io` with `localhost:30
 whichever port you ended up chosing.  Also note that a local relay will out of the box
 be available via HTTP only so don't try to send HTTPS requests there.
 
-## Join us on Discord
-
-You can reach out to Sentry open source contributors and talk with other SDK maintainers on the [Sentry Discord server](https://discord.gg/sentry).
-
 ## Consult Existing SDKs
 
 While we're trying to keep the docs up to date about all important things, it's usually
 a good idea to refer to already existing Sentry SDKs for input.  In particular the
 transport design is not part of the documentation but generally quite similar between
 SDKs.
+
+## Type out context in Relay
+
+To have a better understanding of various [context](https://develop.sentry.dev/sdk/data-model/event-payloads/contexts/) our SDKs emit, any newly added context should also be typed out in [Relay](https://github.com/getsentry/relay/tree/master/relay-event-schema/src/protocol/contexts).
+
+## Join us on Discord
+
+You can reach out to Sentry open source contributors and talk with other SDK maintainers on the [Sentry Discord server](https://discord.gg/sentry).