[Do not merge] Member Roles API documentation

[netramali]

What

I have added a new page called Member Roles that gives information about two new APIs.

Please refer to the RFC for more details.

PRs:
https://github.com/hashicorp/atlas/pull/23200
https://github.com/hashicorp/atlas/pull/23596

Why

The API documentation would help users to find hcp and terraform permissions roles for a specific group .

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. HCP Terraform ).
• Description links to related pull requests or issues, if any.

Content

• Redirects have been added to website/redirects.js for moved, renamed, or deleted pages.
• 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.

[github-actions]

Vercel Previews Deployed

Name	Status	Preview	Updated (UTC)
Dev Portal	✅ Ready (Inspect)	Visit Preview	Tue Sep 30 16:36:08 UTC 2025
Unified Docs API	✅ Ready (Inspect)	Visit Preview	Tue Sep 30 16:21:49 UTC 2025

[github-actions]

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No broken links found! 🎉

[rkoron007]

Thank you so much for writing these! Left some comment to add TFE exclusions and some style feedback. Let me know what you think, or if anything is unclear!