chore(turborepo-docs): typo in code generation (#5445)
### Description
Fixes minimal typo in code gen docs:
- `promps` -> `prompts`
### Testing Instructions
Read docs changes, confirm I know how to spell 🤷
----
### Notes
First chore contribution here! Read through the contributing guide but
didn't see anything for changesets or micro-PRs. Let me know if I'm
missing anything, thanks.
Co-authored-by: Chris Olszewski <chris.olszewski@vercel.com>
