Tweak rationale.md and remove outdated/incorrect stuff (#3853)
Tweak rationale.md and remove outdated/incorrect stuff (#3853)


rattrayalex/prettier,rattrayalex/prettier,existentialism/prettier,prettier/prettier,rattrayalex/prettier,prettier/prettier,jlongster/prettier,existentialism/prettier,existentialism/prettier,prettier/prettier,existentialism/prettier,prettier/prettier