Fix agent shutdown link

[danbarr]

What

Fixes a link on the Manage Agent Pools page which was pointing to a section that doesn't exist on that page. Corrected to send users to the Stop the Agent section on the Install and Run Agents page.

Why

Link was pointing to a non-existent section on the page.

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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).
• [x] Description links to related pull requests or issues, if any.

Content

• [N/A] Redirects have been added for moved, renamed, or deleted pages. This requires a separate PR in the terraform-website repository redirects.next.js file.
• [N/A] API documentation and the API Changelog have been updated.
• [N/A] Links to related content where appropriate (e.g., API endpoints, permissions, etc.).
• [N/A] Pages with related content are updated and link to this content when appropriate.
• [N/A] Sidebar navigation files have been updated for added, deleted, reordered, or renamed pages.
• [N/A] New pages have metadata (page name and description) at the top.
• [N/A] 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.
• [N/A] New code blocks have the correct syntax and line breaks to eliminate horizontal scroll bars.
• [N/A] UI elements (button names, page names, etc.) are bolded.
• [ ] The Vercel website preview successfully deployed.

Reviews

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

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