Update publishing-actions-in-github-marketplace.md

[DarqueWarrior]

Fixed a typo in the docs.

Why:

Closes [issue link]

What's being changed:

Check off the following:

• I have reviewed my changes in staging (look for the latest deployment event in your pull request's timeline, then click View deployment).
• For content changes, I have completed the self-review checklist.

Writer impact (This section is for GitHub staff members only):

• This pull request impacts the contribution experience
  • I have added the 'writer impact' label
  • I have added a description and/or a video demo of the changes below (e.g. a "before and after video")

[welcome]

Thanks for opening this pull request! A GitHub docs team member should be by to give feedback soon. In the meantime, please check out the contributing guidelines.

[janiceilene]

Thank you so much for taking the time to open a PR for this fix @DarqueWarrior 💖 I'll update the branch and get this shipped as soon as tests are passing 🍏

[github-actions]

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