message: docs: add example for template local variable
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diff: @@ -162,6 +162,12 @@ You declare a template input variable using the `let` keyword as in `let hero`.
  There are several such variables in this example: `hero`, `i`, and `odd`.
  +```html
  +<ng-template #hero let-hero let-i="index" let-odd="isOdd">
  + <div [class]="{'odd-row': odd}">{{i}}:{{hero.name}}</div>
  +</ng-template>
  +```
  +
  The variable's scope is limited to a single instance of the repeated template.
  Use the same variable name again in the definition of other structural directives.
  