message: docs: fix closing tags in deprecation summary
  fix closing tags in "Cannot assign to template variables" section
  PR Close
diff: @@ -346,13 +346,13 @@ In the following example, the two-way binding means that `optionName`
  should be written when the `valueChange` event fires.
  ```html
  -<option *ngFor="let optionName of options" [(value)]="optionName"></cmp>
  +<option *ngFor="let optionName of options" [(value)]="optionName"></option>
  ```
  However, in practice, Angular simply ignores two-way bindings to template variables. Starting in version 8, attempting to write to template variables is deprecated. In a future version, we will throw to indicate that the write is not supported.
  ```html
  -<option *ngFor="let optionName of options" [value]="optionName"></cmp>
  +<option *ngFor="let optionName of options" [value]="optionName"></option>
  ```
  {@a binding-to-innertext}
  