docs: fix indentation (#3109)

Author: lukaselmer

public/docs/_examples/router/ts/app/app.component.5.ts

@@ -10,7 +10,7 @@ import { Component } from '@angular/core';
       <a routerLink="/crisis-center" routerLinkActive="active">Crisis Center</a>
       <a routerLink="/heroes" routerLinkActive="active">Heroes</a>
       <a routerLink="/admin" routerLinkActive="active">Admin</a>
-     <a [routerLink]="[{ outlets: { popup: ['compose'] } }]">Contact</a>
+      <a [routerLink]="[{ outlets: { popup: ['compose'] } }]">Contact</a>
     </nav>
     <router-outlet></router-outlet>
     <router-outlet name="popup"></router-outlet>