docs: update Golang Hello World tutorial

docs/01-get-started/03-golang-hello-world.md

@@ -30,17 +30,17 @@ go mod init <your-go-module>
 package main
 
 import (
-    "net/http"
-    "go.uber.org/cadence/.gen/go/cadence/workflowserviceclient"
-    "go.uber.org/cadence/compatibility"
-    "go.uber.org/cadence/worker"
-
-    apiv1 "github.com/uber/cadence-idl/go/proto/api/v1"
-    "github.com/uber-go/tally"
-    "go.uber.org/zap"
-    "go.uber.org/zap/zapcore"
-    "go.uber.org/yarpc"
-    "go.uber.org/yarpc/transport/grpc"
+	"net/http"
+	"go.uber.org/cadence/.gen/go/cadence/workflowserviceclient"
+	"go.uber.org/cadence/compatibility"
+	"go.uber.org/cadence/worker"
+
+	apiv1 "github.com/uber/cadence-idl/go/proto/api/v1"
+	"github.com/uber-go/tally"
+	"go.uber.org/zap"
+	"go.uber.org/zap/zapcore"
+	"go.uber.org/yarpc"
+	"go.uber.org/yarpc/transport/grpc"
 )
 
 var HostPort = "127.0.0.1:7833"
@@ -50,70 +50,70 @@ var ClientName = "test-worker"
 var CadenceService = "cadence-frontend"
 
 func main() {
-    startWorker(buildLogger(), buildCadenceClient())
-    err := http.ListenAndServe(":8080", nil)
-    if err != nil {
-        panic(err)
-    }
+	startWorker(buildLogger(), buildCadenceClient())
+	err := http.ListenAndServe(":8080", nil)
+	if err != nil {
+		panic(err)
+	}
 }
 
 func buildLogger() *zap.Logger {
-    config := zap.NewDevelopmentConfig()
-    config.Level.SetLevel(zapcore.InfoLevel)
+	config := zap.NewDevelopmentConfig()
+	config.Level.SetLevel(zapcore.InfoLevel)
 
-    var err error
-    logger, err := config.Build()
-    if err != nil {
-        panic("Failed to setup logger")
-    }
+	var err error
+	logger, err := config.Build()
+	if err != nil {
+		panic("Failed to setup logger")
+	}
 
-    return logger
+	return logger
 }
 
 func buildCadenceClient() workflowserviceclient.Interface {
-    dispatcher := yarpc.NewDispatcher(yarpc.Config{
+	dispatcher := yarpc.NewDispatcher(yarpc.Config{
 		Name: ClientName,
 		Outbounds: yarpc.Outbounds{
-		  CadenceService: {Unary: grpc.NewTransport().NewSingleOutbound(HostPort)},
+			CadenceService: {Unary: grpc.NewTransport().NewSingleOutbound(HostPort)},
 		},
-	  })
-	  if err := dispatcher.Start(); err != nil {
+	})
+	if err := dispatcher.Start(); err != nil {
 		panic("Failed to start dispatcher")
-	  }
+	}
 
-	  clientConfig := dispatcher.ClientConfig(CadenceService)
+	clientConfig := dispatcher.ClientConfig(CadenceService)
 
-	  return compatibility.NewThrift2ProtoAdapter(
+	return compatibility.NewThrift2ProtoAdapter(
 		apiv1.NewDomainAPIYARPCClient(clientConfig),
 		apiv1.NewWorkflowAPIYARPCClient(clientConfig),
 		apiv1.NewWorkerAPIYARPCClient(clientConfig),
 		apiv1.NewVisibilityAPIYARPCClient(clientConfig),
-	  )
+	)
 }
 
 func startWorker(logger *zap.Logger, service workflowserviceclient.Interface) {
-    // TaskListName identifies set of client workflows, activities, and workers.
-    // It could be your group or client or application name.
-    workerOptions := worker.Options{
-        Logger:       logger,
-        MetricsScope: tally.NewTestScope(TaskListName, map[string]string{}),
-    }
-
-    worker, err := worker.NewV2(
-        service,
-        Domain,
-        TaskListName,
-        workerOptions)
-    if err != nil {
-        panic("Failed to initalize worker")
-    }
-
-    err := worker.Start()
-    if err != nil {
-        panic("Failed to start worker")
-    }
-
-    logger.Info("Started Worker.", zap.String("worker", TaskListName))
+	// TaskListName identifies set of client workflows, activities, and workers.
+	// It could be your group or client or application name.
+	workerOptions := worker.Options{
+		Logger:       logger,
+		MetricsScope: tally.NewTestScope(TaskListName, map[string]string{}),
+	}
+
+	worker, err := worker.NewV2(
+		service,
+		Domain,
+		TaskListName,
+		workerOptions)
+	if err != nil {
+		panic("Failed to initialize worker")
+	}
+
+	err = worker.Start()
+	if err != nil {
+		panic("Failed to start worker")
+	}
+
+	logger.Info("Started Worker.", zap.String("worker", TaskListName))
 }
 ```
 
@@ -174,10 +174,9 @@ func helloWorldActivity(ctx context.Context, name string) (string, error) {
 Don't forget to register the workflow and activity to the worker.
 
 ```go
-func init() {
-    workflow.Register(helloWorldWorkflow)
-    activity.Register(helloWorldActivity)
-}
+// add the following lines to the function startWorker before calling worker.Start()
+worker.RegisterWorkflow(helloWorldWorkflow)
+worker.RegisterActivity(helloWorldActivity)
 ```
 
 Import the missing modules if they were not automatically added.