message: docs: close tags properly
  PR Close
diff: @@ -196,7 +196,7 @@ The `AppComponent` template uses this component as follows:
  ```ts
  @Component({
  selector: 'app-root',
  - template: '<user-detail [user]="selectedUser" />',
  + template: '<user-detail [user]="selectedUser"></user-detail>',
  })
  export class AppComponent {
  selectedUser: User | null = null;
  @@ -228,10 +228,10 @@ When you enable `strictTemplates` and the TypeScript flag `strictNullChecks`, ty
  There are two potential workarounds to the preceding issues:
  - 1. In the template, include the non-null assertion operator `!` at the end of a nullable expression, such as `<user-detail [user]="user!" />`.
  + 1. In the template, include the non-null assertion operator `!` at the end of a nullable expression, such as `<user-detail [user]="user!"></user-detail>`.
  In this example, the compiler disregards type incompatibilities in nullability, just as in TypeScript code.
  - In the case of the `async` pipe, note that the expression needs to be wrapped in parentheses, as in `<user-detail [user]="(user$ | async)!" />`.
  + In the case of the `async` pipe, note that the expression needs to be wrapped in parentheses, as in `<user-detail [user]="(user$ | async)!"></user-detail>`.
  1. Disable strict null checks in Angular templates completely.
  @@ -260,7 +260,7 @@ Consider the following directive:
  selector: 'submit-button',
  template: `
  <div class="wrapper">
  - <button [disabled]="disabled">Submit</button>'
  + <button [disabled]="disabled">Submit</button>
  </div>
  `,
  })
  