docs: update the description of example

[arty-name]

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines: https://github.com/angular/angular/blob/main/contributing-docs/commit-message-guidelines.md
• 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.dev application / infrastructure changes
• Other... Please describe:

What is the current behavior?

The description of the example mentions the ngForOf directive which is no longer present in the example

Issue Number: N/A

What is the new behavior?

The description mentions the @for loop used by the example code

Does this PR introduce a breaking change?

• Yes
• No

Other information

[JeanMeche]

Thanks for this

[alxhub]

This PR was merged into the repository by commit 11727dd.

The changes were merged into the following branches: main, 19.2.x, 20.0.x

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