message: docs(aio): add missing word in the Component metadata section
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diff: @@ -22,7 +22,7 @@ Angular creates, updates, and destroys components as the user moves through the
  <img src="generated/images/guide/architecture/metadata.png" alt="Metadata" class="left">
  -The `@Component` decorator identifies the class immediately below it as a component class, and specifies its metadata. In the example code below, you can see that `HeroListComponent` is just a class, with no special Angular notation or syntax at all. It's not a component until mark it as one with the `@Component` decorator.
  +The `@Component` decorator identifies the class immediately below it as a component class, and specifies its metadata. In the example code below, you can see that `HeroListComponent` is just a class, with no special Angular notation or syntax at all. It's not a component until you mark it as one with the `@Component` decorator.
  The metadata for a component tells Angular where to get the major building blocks it needs to create and present the component and its view. In particular, it associates a _template_ with the component, either directly with inline code, or by reference. Together, the component and its template describe a _view_.
  