Update content/techniques/performance.md

Co-authored-by: Jay McDoniel <[email protected]>

Author: Tony133

content/techniques/performance.md

@@ -79,7 +79,7 @@ new FastifyAdapter({ logger: true });
 
 Middleware functions (when `@nestjs/platform-fastify` is used) retrieve the raw `req` and `res` objects instead of Fastify's wrappers. This is how the `middie` package works (that's used under the hood) and `fastify` - check out this [page(https://www.fastify.io/docs/latest/Reference/Middleware/) for more information,
 
-> warning **Warning** The middleware in `fastify` has an IncomingMessage request type `FastifyRequest['raw']` and a ServerResponse type `FastifyReply['raw']`.
+> warning **Warning** When using `fastify` as the HTTP engine the request parameter of middleware has a type of `FastifyRequest['raw']` and the response parameter has a type `FastifyReply['raw']`.
 
 ```typescript
 @@filename(logger.middleware)