message: docs: refining code of tutorial 7 routing
  Removed the dead code from hero-detail.component.ts
  Fixes
  PR Close
diff: // #docplaster
  // #docregion
  -import { Component, OnInit, Input } from '@angular/core';
  +import { Component, OnInit } from '@angular/core';
  // #docregion added-imports
  import { ActivatedRoute } from '@angular/router';
  import { Location } from '@angular/common';
  @@ -17,7 +17,7 @@ import { HeroService } from '../hero.service';
  styleUrls: [ './hero-detail.component.css' ]
  })
  export class HeroDetailComponent implements OnInit {
  - @Input() hero: Hero;
  + hero: Hero;
  // #docregion ctor
  constructor(
  