docs: fix typo in the router animation docs

[mprinc]

docs(animations): typo in the router animation docs

I assume that instead of output directive there should have been written: outlet directive

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• 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)
• [ x ] 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
• [x ] Documentation content changes
• angular.io application / infrastructure changes
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What is the current behavior?

Issue Number: N/A

What is the new behavior?

Does this PR introduce a breaking change?

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• [x ] No

Other information

[kapunahelewong]

Thanks for this, @mprinc. Do you have a preference as to which of these two PRs we use?

[mprinc]

Hi @kapunahelewong , I do not see another PR at the moment, but the only difference should be in the comment section, the latest one should be more according to the angular specs, otherwise, I do not mind

[kapunahelewong]

Ah, I meant this one: #35099. As they are identical, we can move this one forward and I'll close the other. Thank you very much!

merge-assistance: Global approval for this docs-only change.

[mprinc]

Yes, @kapunahelewong, that is right, the #35100 just corrected title of the #35099

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