refactor(docs-infra): fix docs examples for tslint rules related to object properties (#38143)

This commit updates the docs examples to be compatible with the
`no-string-literal`, `object-literal-key-quotes` and
`object-literal-shorthand` tslint rules.

This is in preparation of updating the docs examples `tslint.json` to
match the one generated for new Angular CLI apps in a future commit.

PR Close #38143

aio/content/examples/http/src/app/config/config.component.ts

@@ -40,8 +40,8 @@ export class ConfigComponent {
     this.configService.getConfig_1()
   // #docregion v1, v1_callback
       .subscribe((data: Config) => this.config = {
-          heroesUrl: data['heroesUrl'],
-          textfile:  data['textfile']
+          heroesUrl: data.heroesUrl,
+          textfile:  data.textfile
       });
   // #enddocregion v1_callback
   }

aio/content/examples/http/src/app/heroes/heroes.service.ts

@@ -16,7 +16,7 @@ import { HttpErrorHandler, HandleError } from '../http-error-handler.service';
 const httpOptions = {
   headers: new HttpHeaders({
     'Content-Type':  'application/json',
-    'Authorization': 'my-auth-token'
+    Authorization: 'my-auth-token'
   })
 };
 // #enddocregion http-options

aio/content/examples/http/src/main-specs.ts

@@ -22,13 +22,13 @@ import './testing/http-client.spec.ts';
 bootstrap();
 
 //
-function bootstrap () {
-  if (window['jasmineRef']) {
+function bootstrap() {
+  if ((window as any).jasmineRef) {
     location.reload();
     return;
   } else {
     window.onload(undefined);
-    window['jasmineRef'] = jasmine.getEnv();
+    (window as any).jasmineRef = jasmine.getEnv();
   }
 
   // First, initialize the Angular testing environment.

aio/content/examples/http/src/testing/global-jasmine.ts

@@ -1,3 +1,3 @@
 import jasmineRequire from 'jasmine-core/lib/jasmine-core/jasmine.js';
 
-window['jasmineRequire'] = jasmineRequire;
+(window as any).jasmineRequire = jasmineRequire;

aio/content/examples/http/src/testing/http-client.spec.ts

@@ -73,7 +73,7 @@ describe('HttpClient testing', () => {
 
     // Make an HTTP GET request with specific header
     httpClient.get<Data>(testUrl, {
-        headers: new HttpHeaders({'Authorization': 'my-auth-token'})
+        headers: new HttpHeaders({Authorization: 'my-auth-token'})
       })
       .subscribe(data =>
         expect(data).toEqual(testData)