plugin/how-terraform-works: Further clarify nested attributes benefits

[bflad]

What

Updates the /plugin/how-terraform-works protocol version 6 documentation to further clarify nested attribute benefits

Why

As part of investigating some differences between sdk/v2 and framework, the individual sensitivity configuration offered by nested attributes in protocol version 6 is important to call out explicitly.

Reference: hashicorp/terraform-plugin-framework#214
Reference: hashicorp/terraform-plugin-sdk#819
Reference: hashicorp/terraform-plugin-sdk#201

Screenshots

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Merge Checklist

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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-common	✅ Ready (Inspect)	Visit Preview	Jul 25, 2022 at 7:57PM (UTC)

[bendbennett]

LGTM