docs(animations): improve wording for animation example

[dario-piotrowicz]

improve the wording of the text explaining an animation
code snippet as that can be misinterpreted

resolves #43952

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?

Issue Number: N/A

The code snippet is explained in an unclear (and in my opinion wrong) way:

What is the new behavior?

The text is simplified and clearer:

Note that animations are applied to html elements, not components, so that's why I believe "component" is wrong there and I substituted it with "element"

Does this PR introduce a breaking change?

• Yes
• No

[mary-poppins]

You can preview 29e9292 at https://pr44168-29e9292.ngbuilds.io/.
You can preview 1e4dc66 at https://pr44168-1e4dc66.ngbuilds.io/.

[ngbot]

I see that you just added the action: merge label, but the following checks are still failing:
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[AndrewKushnir]

Note to the Caretaker: this change is safe to land (CI job failure is unrelated and Pete's approval should be enough for this docs-only change).

[AndrewKushnir]

This PR was merged into the repository by commit 00ae55c.

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