Describe the problem that you experienced

Currently angular documentation doesn't explain about secondary endpoints for library creation https://github.com/ng-packagr/ng-packagr/blob/main/docs/secondary-entrypoints.md . I struggled it for 3 days without this piece of information.

Enter the URL of the topic with the problem

https://angular.dev/tools/libraries/creating-libraries

Describe what you were looking for in the documentation

No response

Describe the actions that led you to experience the problem

No response

Describe what you want to experience that would fix the problem

No response

Add a screenshot if that helps illustrate the problem

No response

If this problem caused an exception or error, please paste it here

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