TF-14885 Add default-project relationship to organization API docs

[ker-an]

Note: Do not merge until we release the change default project feature.

What

This PR adds the default-project relationship to the Organization#update API documentation. I also updated default-pool-param from an attribute because we’re actually patching a relationship.

Why

Organization owners can now update or remove an organization's default project.

Screenshots

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Merge Checklist

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. N/A
• 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. 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. N/A
• 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	Comments	Updated (UTC)
terraform-docs-common	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jul 22, 2024 10:53pm

[trujillo-adam]

A couple of minor style guide suggestions. Approving on behalf of the IPL education team so that you can proceed with merging when necessary.

[jbonhag]

Thanks for leaving this better than you found it! ✨