Prefect Future Utilities Docs Edit

[jeanluciano]

Checklist

• [x] This pull request references any related issue by including "closes <link to issue>"
  • If no issue exists and your change is not a small fix, please create an issue first.
• [x] If this pull request adds new functionality, it includes unit tests that cover the changes
• [x] If this pull request removes docs files, it includes redirect settings in mint.json.
• [x] If this pull request adds functions or classes, it includes helpful docstrings.