docs(link): Correct invalid anchor in link in cookies.md

Author: Lou8is

content/techniques/cookies.md

@@ -98,7 +98,7 @@ findAll(@Res({ passthrough: true }) response: FastifyReply) {
 
 To read more about `FastifyReply#setCookie()` method, check out this [page](https://github.com/fastify/fastify-cookie#sending).
 
-> warning **Warning** If you want to leave the response handling logic to the framework, remember to set the `passthrough` option to `true`, as shown above. Read more [here](/controllers#appendix-library-specific-approach).
+> warning **Warning** If you want to leave the response handling logic to the framework, remember to set the `passthrough` option to `true`, as shown above. Read more [here](/controllers#library-specific-approach).
 
 > info **Hint** The `@Res()` decorator is imported from the `@nestjs/common`, while `FastifyReply` from the `fastify` package.