Update examples to simplify error usage

internal/model/api/api.go

@@ -302,14 +302,12 @@ func (a *API) ExampleGoCode() string {
 		exs = append(exs, o.Example())
 	}
 
-	code := fmt.Sprintf("import (\n%q\n%q\n%q\n\n%q\n%q\n%q\n%q\n)\n\n"+
+	code := fmt.Sprintf("import (\n%q\n%q\n%q\n\n%q\n%q\n)\n\n"+
 		"var _ time.Duration\nvar _ bytes.Buffer\n\n%s",
 		"bytes",
 		"fmt",
 		"time",
 		"github.com/aws/aws-sdk-go/aws",
-		"github.com/aws/aws-sdk-go/aws/awserr",
-		"github.com/aws/aws-sdk-go/aws/awsutil",
 		"github.com/aws/aws-sdk-go/service/"+a.PackageName(),
 		strings.Join(exs, "\n\n"),
 	)

internal/model/api/operation.go

@@ -127,22 +127,14 @@ func Example{{ .API.StructName }}_{{ .ExportedName }}() {
 	resp, err := svc.{{ .ExportedName }}(params)
 
 	if err != nil {
-		if awsErr, ok := err.(awserr.Error); ok {
-			// Generic AWS error with Code, Message, and original error (if any)
-			fmt.Println(awsErr.Code(), awsErr.Message(), awsErr.OrigErr())
-			if reqErr, ok := err.(awserr.RequestFailure); ok {
-				// A service error occurred
-				fmt.Println(reqErr.Code(), reqErr.Message(), reqErr.StatusCode(), reqErr.RequestID())
-			}
-		} else {
-			// This case should never be hit, the SDK should always return an
-			// error which satisfies the awserr.Error interface.
-			fmt.Println(err.Error())
-		}
+		// Print the error, cast err to awserr.Error to get the Code and
+		// Message from an error.
+		fmt.Println(err.Error())
+		return
 	}
 
 	// Pretty-print the response data.
-	fmt.Println(awsutil.Prettify(resp))
+	fmt.Println(resp)
 }
 `))