fix: typos in samples (#1728)

* fix: typos in samples

* chore: Fix copyright

* chore: Fix copyright

---------

Co-authored-by: Daniel Bankhead <dan@danielbankhead.com>
Co-authored-by: Daniel Bankhead <danielbankhead@google.com>

samples/jwt.js

@@ -1,9 +1,10 @@
-// Copyright 2017, Google, Inc.
+// Copyright 2017 Google LLC
+//
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
 //
-//    http://www.apache.org/licenses/LICENSE-2.0
+//      http://www.apache.org/licenses/LICENSE-2.0
 //
 // Unless required by applicable law or agreed to in writing, software
 // distributed under the License is distributed on an "AS IS" BASIS,
@@ -27,7 +28,7 @@ const {JWT} = require('google-auth-library');
 const fs = require('fs');
 
 async function main(
-  // Full path to the sevice account credential
+  // Full path to the service account credential
   keyFile = process.env.GOOGLE_APPLICATION_CREDENTIALS
 ) {
   const keys = JSON.parse(fs.readFileSync(keyFile, 'utf8'));

samples/keyfile.js

@@ -1,9 +1,10 @@
-// Copyright 2018, Google, LLC.
+// Copyright 2018 Google LLC
+//
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
 //
-//    http://www.apache.org/licenses/LICENSE-2.0
+//      http://www.apache.org/licenses/LICENSE-2.0
 //
 // Unless required by applicable law or agreed to in writing, software
 // distributed under the License is distributed on an "AS IS" BASIS,
@@ -22,7 +23,7 @@ const {GoogleAuth} = require('google-auth-library');
  * Acquire a client, and make a request to an API that's enabled by default.
  */
 async function main(
-  // Full path to the sevice account credential
+  // Full path to the service account credential
   keyFile = process.env.GOOGLE_APPLICATION_CREDENTIALS
 ) {
   const auth = new GoogleAuth({

samples/scripts/externalclient-setup.js

@@ -165,7 +165,7 @@ async function main(config) {
   const awsAudience = `//iam.googleapis.com/${poolResourcePath}/providers/${awsProviderId}`;
 
   // Allow service account impersonation.
-  // Get the existing IAM policity bindings on the current service account.
+  // Get the existing IAM policy bindings on the current service account.
   response = await iam.projects.serviceAccounts.getIamPolicy({
     resource: `projects/${projectId}/serviceAccounts/${clientEmail}`,
   });

samples/test/externalclient.test.js

@@ -50,7 +50,7 @@
 // AWS provider tests for AWS credentials
 // -------------------------------------
 // The test suite will also run tests for AWS credentials. This works as
-// follows. (Note prequisite setup is needed. This is documented in
+// follows. (Note prerequisite setup is needed. This is documented in
 // externalclient-setup.js).
 // - iamcredentials:generateIdToken is used to generate a Google ID token using
 //   the service account access token. The service account client_id is used as