Add detail to Router NavigationCancel event doc

[jbogarthyde]

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines: https://github.com/angular/angular/blob/master/CONTRIBUTING.md#commit
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

• Bugfix
• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Build related changes
• CI related changes
• Documentation content changes
• angular.io application / infrastructure changes
• Other... Please describe:

What is the current behavior?

Description of event trigger is minimal.

Issue Number: #32096

What is the new behavior?

Expands description with cases where nav is canceled indirectly.

Does this PR introduce a breaking change?

• Yes
• No

[mary-poppins]

You can preview e135ad0 at https://pr32140-e135ad0.ngbuilds.io/.

[dzhavat]

Thanks for making the PR :)

I wanted to work on this issue as well in order to start contributing. Even prepared a small commit earlier today. My change looks like this:

/**
 * An event triggered when a navigation is canceled.
 *
 * The event is triggered when a route guard:
 * 
 * * returns `false`
 * * initiates a redirect by returning a {@link UrlTree}
 * 
 * @publicApi
 */

I've also deleted the sentence This is due to a Route Guard returning false during navigation. in the router page because that's not the only case.

Maybe you can do that as well?

[jbogarthyde]

Thanks! Will do.

[mary-poppins]

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[mary-poppins]

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[mary-poppins]

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[mary-poppins]

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[mary-poppins]

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[mary-poppins]

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[mary-poppins]

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[jbogarthyde]

Doc only, should not need G3.
There doesn't seem to be a code-owner for Router anymore.

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