fixing yaml instructions for github actions doc

[tomvcassidy]

#122214

[prmerger-automator]

Microsoft authors of articles need to make updates through the private repository, so the updates can be staged and validated by current validation rules. After you review staging and fix all validation issues, you can add the sign-off comment to let the PR reviewers know the updates are ready to be merged.

It's easy to access the private repo version of your articles in GitHub. Just add -pr to the URL, as follows:

 Public repo URL: https://github.com/MicrosoftDocs/{docs-repo}
 Private repo URL: https://github.com/MicrosoftDocs/{docs-repo-pr}

We have closed this pull request. Please resubmit the updates through the private repo. For more information, see the contributor guide.

[learn-build-service-prod]

Learn Build status updates of commit edd6bd4:

✅ Validation status: passed

File	Status	Preview URL	Details
articles/container-instances/container-instances-github-action.md	✅Succeeded

For more details, please refer to the build report.

For any questions, please:

• Try searching the learn.microsoft.com contributor guides
• Post your question in the Learn support channel