Add missing end quote

[nashafa]

Add a missing end quote in the ProjectV2FieldCommon demo query command.

Why:

The listed command is missing an end quote. There is no existing issue for this; I hope one doesn't need to me made for a simple fix like this.

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

Just adding a missing end quote.

Check off the following:

• I have reviewed my changes in staging (look for the "Automatically generated comment" and click the links in the "Preview" column to view your latest changes).
• 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")

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[github-actions]

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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
issues/planning-and-tracking-with-projects/automating-your-project/using-the-api-to-manage-projects.md	fpt ghec	fpt ghec

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

[cmwilson21]

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

[sophietheking]

Hi @nashafa 👋 Thanks for taking the time to open a PR and fix this bug, we really appreciate it!

This change looks good to me, I'll get this merged for you. 🚀

[github-actions]

Thanks very much for contributing! Your pull request has been merged 🎉 You should see your changes appear on the site in approximately 24 hours. If you're looking for your next contribution, check out our help wanted issues ⚡