Mark Filter#keywords and statuses as nullable in API response

[saket]

The API documentation for Filter indicates that keywords and statuses are non-nullable fields, which doesn't seem to be the case when they're served as part of a Status. This was clarified by @ClearlyClaire here:

The keywords and statuses are only returned when you query the filter. They are left out of the filtered attribute because that information is generally not useful in that context and would cause an unwarranted increase in payload size.

Can the doc be updated to mark them as nullable?