Update creating-an-issue.md

[amandamartin-dev]

Why:

Closes #22835

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

Adding a tip that query parameters also work for custom fields in issue template creation on line 173 just below the query parameters table

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• 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.

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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
issues/tracking-your-work-with-issues/creating-an-issue.md	fpt ghec ghes@ 3.7 3.6 3.5 3.4 3.3 ghae	fpt ghec ghes@ 3.7 3.6 3.5 3.4 3.3 ghae

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

[cmwilson21]

@amandamartin-dev Thanks for submitting a PR to fix your issue! 👍

I'll get this triaged for review! ⚡

[saritai]

@amandamartin-dev Thanks so much for opening this PR! ✨ Your addition looked good - however, I looked into this a bit further and I think the information you were looking for is already there (the paragraph under the table of query parameters), but the language could definitely be improved as it was a bit unclear and easy to miss!

Basically, custom fields can be defined in YAML issue forms (not the original Markdown issue templates), and YAML issue templates are only supported for GitHub.com and Enterprise Cloud (not yet Enterprise Server).

I have added a suggestion to update that paragraph using some of the language that you originally added, to make it clearer! Take a look at the preview and let me know if that looks good to you - if you think it still might be unclear, we could try putting it in "Tip" form as well. 👍

[saritai]

@amandamartin-dev Awesome, looks good to me! Marking this as ready to merge - thanks again for catching this and opening this PR! ✨

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