docs: fix typos and improve abbreviation usage in DESIGN_GOALS.md (#36170)

Hi! While reviewing the React Compiler documentation, I noticed a few
minor issues in DESIGN_GOALS.md:


- Fixed a typo: `outweight` → `outweigh` in the Non-Goals section.

- Updated all instances of `ie` to the standard `i.e.` for better
consistency and clarity throughout the document.


Happy to contribute!

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## Summary

Fixed a typo (outweight -> outweigh) and standardized abbreviation usage
(ie -> i.e.) in the DESIGN_GOALS.md file for the React Compiler
documentation. This improves the overall professionalism and readability
of the document.

## How did you test this change?

This is a documentation-only change. I verified the formatting and
consistency of the edits.