Add node docs for tRPC middleware (#6620)

Co-authored-by: Shana Matthews <shana.l.matthews@gmail.com>

Author: Luca Forstner

src/platforms/node/common/configuration/integrations/pluggable-integrations.mdx

@@ -137,3 +137,26 @@ Sentry.init({
   tracePropagationTargets: ["my-site-url.com"],
 });
 ```
+
+## Frameworks
+
+### tRPC Middleware
+
+_(New in version 7.48.0)_
+
+The Sentry tRPC middleware helps make sure your transactions related to RPCs are well-named.
+Additionally, it can attach RPC input via the `attachRpcInput` option.
+
+```typescript
+import { initTRPC } from "@trpc/server";
+import * as Sentry from "@sentry/node";
+
+const t = initTRPC.context().create();
+const sentryMiddleware = t.middleware(
+  Sentry.Handlers.trpcMiddleware({
+    attachRpcInput: true,
+  })
+);
+
+const sentrifiedProcedure = t.procedure.use(sentryMiddleware);
+```