Fix misleading example of reusable workflows

[joshjohanning]

Why:

Closes #19904

cc @dne @lucascosti

What's being changed (if available, include any code snippets, screenshots, or gifs):

Entirely removing the local action reference since with a reusable workflow, it's confusing.

The local action needs to live in the calling repository, not the reusable workflow repository.

I just used a generic/non-existent my-org/my-action@main action reference instead to not confuse multiple topics.

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Content directory changes

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Source	Preview	Production	What Changed
actions/using-workflows/reusing-workflows.md	fpt ghec ghes@ 3.6 3.5 3.4	fpt ghec ghes@ 3.6 3.5 3.4

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ghes: GitHub Enterprise Server
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[lucascosti]

Thanks for this, @joshjohanning! I made a slight change to the action to match our usual style (e.g. using octo-org as an example, and using a tag as a ref). I agree that not showing a local action should make things a lot clearer. 🙇‍♂️

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[joshjohanning]

@lucascosti perfect!