docs: Update manifest-json.md

[hanslemm]

What are you changing in this pull request and why?

Remove unnecessary table. Simplify paragraph.

Checklist

• Review the Content style guide and About versioning so my content adheres to these guidelines.
• Add a checklist item for anything that needs to happen before this PR is merged, such as "needs technical review" or "change base branch."

[welcome]

Hello!👋 Thanks for contributing to the dbt product documentation and opening this pull request! ✨
We use Markdown and some HTML to write the dbt product documentation. When writing content, you can use our style guide and content types to understand our writing standards and how we organize information in the dbt product docs.
We'll review your contribution and respond as soon as we can. 😄

[vercel]

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A member of the Team first needs to authorize it.

[mirnawong1]

hey @hanslemm ! great suggestion and i appreciate your first contribution! this looks great and i added a small sugg to link to the top of the page. this looks so great and i appreciate you contributing to the docs ✨

merging this for you!

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
docs-getdbt-com	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Sep 25, 2023 2:37pm