docs(angular): add @for content (#6392)

src/data/roadmaps/angular/content/for@2kYS9w1UzQFZ1zhf01m9L.md

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 # @for
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+The @for block repeatedly renders content of a block for each item in a collection.
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+Visit the following resources to learn more:
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+- [@official@Angular Official Docs - @for](https://angular.dev/api/core/@for)