docs: remove unused properties from forms overview example (#25663)

PR Close #25663

aio/content/examples/forms-overview/src/app/app.module.ts

@@ -14,7 +14,6 @@ import { TemplateModule } from './template/template.module';
     ReactiveModule,
     TemplateModule
   ],
-  providers: [],
   bootstrap: [AppComponent]
 })
 export class AppModule { }

aio/content/examples/forms-overview/src/app/reactive/favorite-color/favorite-color.component.ts

@@ -5,8 +5,7 @@ import { FormControl } from '@angular/forms';
   selector: 'app-reactive-favorite-color',
   template: `
     Favorite Color: <input type="text" [formControl]="favoriteColorControl">
-  `,
-  styles: []
+  `
 })
 export class FavoriteColorComponent {
   favoriteColorControl = new FormControl('');

aio/content/examples/forms-overview/src/app/template/favorite-color/favorite-color.component.ts

@@ -4,8 +4,7 @@ import { Component } from '@angular/core';
   selector: 'app-template-favorite-color',
   template: `
     Favorite Color: <input type="text" [(ngModel)]="favoriteColor">
-  `,
-  styles: []
+  `
 })
 export class FavoriteColorComponent {
   favoriteColor = '';