update example doc

example/shorturl/api/internal/svc/servicecontext.go

@@ -1,11 +1,20 @@
 package svc
 
-import "shorturl/api/internal/config"
+import (
+	"shorturl/api/internal/config"
+	"shorturl/rpc/transform/transformer"
+
+	"github.com/tal-tech/go-zero/rpcx"
+)
 
 type ServiceContext struct {
-	Config config.Config
+	Config      config.Config
+	Transformer transformer.Transformer
 }
 
 func NewServiceContext(c config.Config) *ServiceContext {
-	return &ServiceContext{Config: c}
+	return &ServiceContext{
+		Config:      c,
+		Transformer: transformer.NewTransformer(rpcx.MustNewClient(c.Transform)),
+	}
 }