message: docs(forms): properly convert number to string for formControlName input
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diff: @@ -17,7 +17,7 @@ import {FormArray, FormControl, FormGroup} from '@angular/forms';
  <form [formGroup]="form" (ngSubmit)="onSubmit()">
  <div formArrayName="cities">
  <div *ngFor="let city of cities.controls; index as i">
  - <input [formControlName]="i" placeholder="City">
  + <input formControlName="{{i}}" placeholder="City">
  </div>
  </div>
  <button>Submit</button>
  