Fix misleading example of reusable workflows

[dne]

Code of Conduct

• I have read and agree to the GitHub Docs project's Code of Conduct

What article on docs.github.com is affected?

https://docs.github.com/en/actions/using-workflows/reusing-workflows

What part(s) of the article would you like to see updated?

The example reusable workflow in this article can lead newcomers to mix up reusable workflows with local actions.

A recent change from #15481 made this worse/more misleading. I propose to at least revert c9186d0 and maybe add a comment that the example references an action not a reusable workflow.

Additional information

I just spent some time trying (and failing) to use a reusable workflow as a step in a workflow job because I was mislead by this example, as have other users apparently.

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[cmwilson21]

@dne Thanks so much for opening an issue! I'll triage this for the team to take a look 👀

[lucascosti]

👋 @dne, thanks a lot for pointing this out! You are 100% correct; feel free for yourself (or anyone) to open a PR. Otherwise I should get to it in the next few days.

[joshjohanning]

Just PR'd this in #20324

I removed the local action reference entirely since I agree, it's messy at best.