Fix go_package path in proto example to use relative path

Co-authored-by: asim <17530+asim@users.noreply.github.com>

Author: Copilot

internal/website/docs/guides/grpc-compatibility.md

@@ -67,7 +67,7 @@ service := micro.NewService(
 syntax = "proto3";
 
 package helloworld;
-option go_package = "/proto;helloworld";
+option go_package = "./proto;helloworld";
 
 service Say {
     rpc Hello(Request) returns (Response) {}