Update LangRef - integer sets should have at least one constraint

- this change is already consistent with the current code
- having no constraints made the integer set spec look odd - as nothing appears
  between ':' and the closing parenthesis
- there is no loss in representational power - an unconstrained set can always
  be represented by a trivially true constraint

PiperOrigin-RevId: 229307353
1 file changed
tree: f22de77309b9e9e94553c510ae7d5e8082e6211b
  1. g3doc/
  2. include/
  3. lib/
  4. test/
  5. tools/
  6. utils/
  7. .clang-format
  8. LICENSE.TXT