docs: updated docs removed unnecessary imports and empty methods (#48546)

Removed empty methods and unnecessary imports in files

PR Close #48546

aio/content/examples/toh-pt3/src/app/heroes/heroes.component.ts

@@ -1,4 +1,4 @@
-import { Component, OnInit } from '@angular/core';
+import { Component } from '@angular/core';
 import { Hero } from '../hero';
 import { HEROES } from '../mock-heroes';
 
@@ -7,17 +7,12 @@ import { HEROES } from '../mock-heroes';
   templateUrl: './heroes.component.html',
   styleUrls: ['./heroes.component.css']
 })
-export class HeroesComponent implements OnInit {
+export class HeroesComponent {
 
   heroes = HEROES;
 
   selectedHero!: Hero;
 
-  constructor() { }
-
-  ngOnInit(): void {
-  }
-
   onSelect(hero: Hero): void {
     this.selectedHero = hero;
   }

aio/content/examples/toh-pt4/src/app/hero-detail/hero-detail.component.ts

@@ -1,4 +1,4 @@
-import { Component, OnInit, Input } from '@angular/core';
+import { Component, Input } from '@angular/core';
 import { Hero } from '../hero';
 
 @Component({
@@ -6,13 +6,8 @@ import { Hero } from '../hero';
   templateUrl: './hero-detail.component.html',
   styleUrls: ['./hero-detail.component.css']
 })
-export class HeroDetailComponent implements OnInit {
+export class HeroDetailComponent {
 
   @Input() hero: Hero | undefined;
 
-  constructor() { }
-
-  ngOnInit(): void {
-  }
-
 }

aio/content/examples/upgrade-lazy-load-ajs/src/app/app404/app404.component.ts

@@ -1,15 +1,8 @@
-import { Component, OnInit } from '@angular/core';
+import { Component } from '@angular/core';
 
 @Component({
   selector: 'app-app404',
   templateUrl: './app404.component.html',
   styleUrls: ['./app404.component.css']
 })
-export class App404Component implements OnInit {
-
-  constructor() { }
-
-  ngOnInit() {
-  }
-
-}
+export class App404Component {}