Clarify that messages can be errors _or_ warnings

[jsoref]

Why:

• Closes: Publishing actions in GitHub Marketplace appears to wrongly suggest you will see an "Everything looks good!" message #35440

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

Check off the following:

• A subject matter expert (SME) has reviewed the technical accuracy of the content in this PR. In most cases, the author can be the SME. Open source contributions may require an SME review from GitHub staff.
• The changes in this PR meet the docs fundamentals that are required for all content.
• All CI checks are passing and the changes look good in the preview environment.

[github-actions]

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Content directory changes

You may find it useful to copy this table into the pull request summary. There you can edit it to share links to important articles or changes and to give a high-level overview of how the changes in your pull request support the overall goals of the pull request.

Source	Preview	Production	What Changed
actions/sharing-automations/creating-actions/publishing-actions-in-github-marketplace.md	fpt ghec	fpt ghec

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Key: fpt: Free, Pro, Team; ghec: GitHub Enterprise Cloud; ghes: GitHub Enterprise Server
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[isaacmbrown]

Thanks @jsoref, will get this merged for you

[github-actions]

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