message: docs: fix minor error in the "Structural directives" guide
  The sample code used in this guide uses [class.od]="odd".
  But, in another portion of the guide, [ngClass]="odd" is mentioned instead.
  PR Close
diff: @@ -251,7 +251,7 @@ You enable these features in the string assigned to `ngFor`, which you write in
  Everything _outside_ the `ngFor` string stays with the host element
  (the `<div>`) as it moves inside the `<ng-template>`.
  -In this example, the `[ngClass]="odd"` stays on the `<div>`.
  +In this example, the `[class.odd]="odd"` stays on the `<div>`.
  </div>
  