fix: changes as per comments

samples/backups-copy.js

@@ -1,4 +1,4 @@
-// Copyright 2021 Google LLC
+// Copyright 2022 Google LLC
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -12,10 +12,6 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-// sample-metadata:
-//  title: Read data using an existing index.
-//  usage: node spannerCopyBackup <INSTANCE_ID> <DATABASE_ID> <PROJECT_ID>
-
 'use strict';
 
 function main(
@@ -32,7 +28,7 @@ function main(
   // const instanceId = 'my-instance';
   // const databaseId = 'my-database';
   // const backupId = 'my-backup',
-  // sourceBackupId = 'my-source-backup',
+  // const sourceBackupId = 'my-source-backup',
   // const projectId = 'my-project-id';
 
   // Imports the Google Cloud Spanner client library
@@ -50,7 +46,7 @@ function main(
     const database = instance.database(databaseId);
     const sourceBackup = instance.backup(sourceBackupId);
 
-    // Expire source and copy backup 14 days in the future
+    // Expire copy backup 14 days in the future
     const expireTime = Spanner.timestamp(
       Date.now() + 1000 * 60 * 60 * 24 * 14
     ).toStruct();

samples/index-read-data.js

@@ -12,10 +12,6 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-// sample-metadata:
-//  title: Read data using an existing index.
-//  usage: node readDataWithIndex <INSTANCE_ID> <DATABASE_ID> <PROJECT_ID>
-
 'use strict';
 
 function main(

samples/system-test/spanner.test.js

@@ -64,7 +64,6 @@ const DEFAULT_LEADER_2 = 'us-east1';
 
 const spanner = new Spanner({
   projectId: PROJECT_ID,
-  apiEndpoint: 'staging-wrenchworks.sandbox.googleapis.com',
 });
 const LABEL = 'node-sample-tests';
 const GAX_OPTIONS = {

src/instance.ts

@@ -258,7 +258,7 @@ class Instance extends common.GrpcServiceObject {
   ): Promise<CopyBackupResponse> | void {
     if (!backupId || !sourceBackupId) {
       throw new Error(
-        'A backup ID and source backup ID is required to create a Backup.'
+        'A backup ID and source backup ID is required to create a copy of the source backup.'
       );
     }
     const copyOfBackup = new Backup(this, backupId, sourceBackupId);