Update content/middlewares.md

Author: kamilmysliwiec

content/middlewares.md

@@ -20,7 +20,7 @@ Nest middleware are, by default, equivalent to [express](https://expressjs.com/e
 
 You implement custom Nest middleware in either a function, or in a class with an `@Injectable()` decorator. The class should implement the `NestMiddleware` interface, while the function does not have any special requirements. Let's start by implementing a simple middleware feature using the class method.
 
->  warning **Warning** `Express` and `fastify` handle middleware differently and provide different method signatures, read more [here](https://docs.nestjs.com/techniques/performance#middleware).
+>  warning **Warning** `Express` and `fastify` handle middleware differently and provide different method signatures, read more [here](/techniques/performance#middleware).
 
 
 ```typescript