message: docs: fix typo on router guide
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diff: @@ -3597,7 +3597,7 @@ of its values. You use the `take` operator with an argument of `1` to ensure tha
  Observable completes after retrieving the first value from the Observable returned by the
  `getCrisis` method.
  -If it doesn't return a valid `Crisis`, return an empty `Observable`, canceling the previous in-flight navigation to the `CrisisDetailComponent` and navigate the user back to the `CrisisListComponent`. The update resolver service looks like this:
  +If it doesn't return a valid `Crisis`, return an empty `Observable`, canceling the previous in-flight navigation to the `CrisisDetailComponent` and navigate the user back to the `CrisisListComponent`. The updated resolver service looks like this:
  <code-example path="router/src/app/crisis-center/crisis-detail-resolver.service.ts" header="src/app/crisis-center/crisis-detail-resolver.service.ts"></code-example>
  