refactor(docs-infra): fix docs examples for Angular-specific tslint rules (#38143)

This commit updates the docs examples to be compatible with the
following Angular-specific tslint rules:
- `component-selector`
- `directive-selector`
- `no-conflicting-lifecycle`
- `no-host-metadata-property`
- `no-input-rename`
- `no-output-native`
- `no-output-rename`

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/dynamic-component-loader/src/app/ad-banner.component.ts

@@ -11,7 +11,7 @@ import { AdComponent } from './ad.component';
   template: `
               <div class="ad-banner-example">
                 <h3>Advertisements</h3>
-                <ng-template ad-host></ng-template>
+                <ng-template adHost></ng-template>
               </div>
             `
   // #enddocregion ad-host

aio/content/examples/dynamic-component-loader/src/app/ad.directive.ts

@@ -1,8 +1,9 @@
+// tslint:disable: directive-selector
 // #docregion
 import { Directive, ViewContainerRef } from '@angular/core';
 
 @Directive({
-  selector: '[ad-host]',
+  selector: '[adHost]',
 })
 export class AdDirective {
   constructor(public viewContainerRef: ViewContainerRef) { }