Update/correct TypeScript docs to reflect current best practice (#2598)
Update/correct TypeScript docs to reflect current best practice (#2598)

* Update/correct TypeScript docs to reflect current best practice

#2596

* Clean up typescript.mdx per Andarist's suggestions

* Add back deleted section to typescript.mdx
tkh44/emotion,emotion-js/emotion,emotion-js/emotion,tkh44/emotion,emotion-js/emotion,emotion-js/emotion