Fix invalid link on netty server (#4746)

Author: dragove

doc/server/netty.md

@@ -49,7 +49,7 @@ val binding: Future[NettyFutureServerBinding] =
 The `tapir-netty-server-sync` server uses `Identity[T]` as its wrapper effect for compatibility; `Identity[A]` means in 
 fact just `A`, representing direct style. It is available only for Scala 3.
 
-See [examples/HelloWorldNettySyncServer.scala](https://github.com/softwaremill/tapir/blob/master/examples/src/main/scala/sttp/tapir/examples/HelloWorldNettySyncServer.scala) for a full example.
+See [examples/helloWorldNettySyncServer.scala](https://github.com/softwaremill/tapir/blob/master/examples/src/main/scala/sttp/tapir/examples/helloWorldNettySyncServer.scala) for a full example.
 
 To provide server logic for an endpoint when using the `-sync` server, you can use the dedicated `handle`
 methods, and its variants. This provides better type inference.