message: docs: fix selector in Component Interaction guide
  The selector for the `CountdownTimerComponent` is `app-countdown-timer`
  not `countdown-timer`.
  PR Close
diff: @@ -165,7 +165,7 @@ The `CountdownLocalVarParentComponent` that hosts the timer component is as foll
  The parent component cannot data bind to the child's `start` and `stop` methods nor to its `seconds` property.
  -Place a local variable, `#timer`, on the tag `<countdown-timer>` representing the child component.
  +Place a local variable, `#timer`, on the tag `<app-countdown-timer>` representing the child component.
  That gives you a reference to the child component and the ability to access *any of its properties or methods* from within the parent template.
  This example wires parent buttons to the child's `start` and `stop` and uses interpolation to display the child's `seconds` property.
  