Remove no workflow files prerequisite

[tommoor]

Why:

Closes: #43228

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

I removed the incorrect prerequisite

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 review environment.

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Table of review links

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Source	Review	Production	What Changed
actions/how-tos/create-and-publish-actions/publish-in-github-marketplace.md	fpt ghec	fpt ghec

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

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[Copilot]

Pull request overview

Removes an inaccurate prerequisite from the “Publishing actions in GitHub Marketplace” article, aligning the documentation with actual requirements for publishing actions.

Changes:

• Removed the prerequisite stating that action repositories must not contain workflow files.