Add missing heading for steps.working-directory

[GMZwinge]

Update workflow-syntax-for-github-actions.md

Why:

Closes: None

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

In production, the jobs.<job_id>.steps[*].run section starts talking about working-directory without a heading for the working-directory. It starts talking about the working-directory with: Using the working-directory keyword, you can specify the working directory of where to run the command.

This PR adds the heading just above that line.

Check off the following:

• I have reviewed my changes in staging, available via the View deployment link in this PR's timeline.

  • For content changes, you will also see an automatically generated comment with links directly to pages you've modified. The comment won't appear if your PR only edits files in the data directory.

• For content changes, I have completed the self-review checklist.

[welcome]

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[github-actions]

Automatically generated comment ℹ️

This comment is automatically generated and will be overwritten every time changes are committed to this branch.

The table contains an overview of files in the content directory that have been changed in this pull request. It's provided to make it easy to review your changes on the staging site. Please note that changes to the data directory will not show up in this table.

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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/using-workflows/workflow-syntax-for-github-actions.md	fpt ghec ghes@ 3.10 3.9 3.8 3.7 3.6 ghae	fpt ghec ghes@ 3.10 3.9 3.8 3.7 3.6 ghae

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fpt: Free, Pro, Team
ghec: GitHub Enterprise Cloud
ghes: GitHub Enterprise Server
ghae: GitHub AE

[cmwilson21]

@GMZwinge Thanks so much for submitting a PR! I'll get this triaged for review ⚡

[SiaraMist]

Thanks for fixing this, @GMZwinge! I'll go ahead and get this merged. 🚀

[github-actions]

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