message: Clarify the constants changelog entry [skip ci]
diff: @@ -713,7 +713,7 @@ for the list of changes made since `v2.0.0-alpha.1`.
  - `parseISO` function that parses ISO 8601 strings. See [#1023](https://github.com/date-fns/date-fns/pull/1023).
  -- Add constants:
  +- Add constants that can be imported directly from `date-fns` or the submodule `date-fns/constants`:
  - `maxTime`
  