doc: update TS version for --incremental (#25736)
doc: update TS version for --incremental (#25736)

1. Stable version of TypeScript 4.3 just released, replaced beta version tag with stable version v4.3.2.
2. Add reference article explaining about the performance improvement.

## Documentation / Examples

- [x] Make sure the linting passes
flybayer/next.js,zeit/next.js,JeromeFitz/next.js,zeit/next.js,JeromeFitz/next.js,flybayer/next.js,azukaru/next.js,JeromeFitz/next.js,azukaru/next.js,zeit/next.js,azukaru/next.js,flybayer/next.js,JeromeFitz/next.js,flybayer/next.js,azukaru/next.js