Update agents.mdx

[darrell-fashun]

Adding use case for agent single execution mode when runs are queued from the UI

What

Why

Screenshots

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Merge Checklist

If items do not apply to your changes, add (N/A) and mark them as complete.

Pull Request

• [ ] One or more labels describe the type of change (e.g. clarification) and associated product (e.g. tfc).
• [ ] Description links to related pull requests or issues, if any.

Content

• [ ] Redirects have been added for moved, renamed, or deleted pages. This requires a separate PR in the terraform-website repository redirects.next.js file.
• [ ] API documentation and the API Changelog have been updated.
• [ ] Links to related content where appropriate (e.g., API endpoints, permissions, etc.).
• [ ] Pages with related content are updated and link to this content when appropriate.
• [ ] Sidebar navigation files have been updated for added, deleted, reordered, or renamed pages.
• [ ] New pages have metadata (page name and description) at the top.
• [ ] New images are 2048 px wide. They have HashiCorp standard annotation color (#F92672) and format (rectangle with rounded corners), blurred sensitive details (e.g. credentials, usernames, user icons), and descriptive alt text in the markdown for accessibility.
• [ ] New code blocks have the correct syntax and line breaks to eliminate horizontal scroll bars.
• [ ] UI elements (button names, page names, etc.) are bolded.
• [ ] The Vercel website preview successfully deployed.

Reviews

• [ ] I or someone else reviewed the content for technical accuracy.
• [ ] I or someone else reviewed the content for typos, punctuation, spelling, and grammar.

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Name	Status	Preview	Updated
terraform-docs-agents	✅ Ready (Inspect)	Visit Preview	Nov 18, 2022 at 8:51PM (UTC)

[laurapacilio]

@darrell-fashun - here's a screenshot of the current preview, without my changes. The formatting for the yellow boxes isn't quite right, but you can actually see how it might all look as text! I can show you another preview once you add the changes in, if that's helpful. Thank you!