Add clarifying details for private module registry version attribute commit-sha

[tism]

What

Update the default and description for the commit-sha attribute when creating a non-VCS connected private registry module version

Why

Clarifies what is needed by the API

Screenshots

N/A

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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. 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. (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. (N/A)
• The Vercel website preview successfully deployed.

Reviews

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

[vercel]

@tism is attempting to deploy a commit to the HashiCorp Team on Vercel.

A member of the Team first needs to authorize it.

[rkoron007]

@tism Apologies on the slow review here! Added a small style suggestion.

Heads up that we will be migrating the content from terraform-docs-common into the UDR repo (https://github.com/hashicorp/web-unified-docs) this week. I'm going through and merging any documentation PRs we can get in before migration, so if this is ready to merge after my suggestions please feel free to do so!

[tism]

@rkoron007 I've put you suggestion into a new commit as GH wouldn't let me add it automatically, and merged. Thank you! 🥳