[Improvement]: Update Dashboard REST API request for derived properties

[ningatamplitude]

What can we improve?

Document how customers can filter or group by derived properties in a dashboard rest api call

Under this section: https://www.docs.developers.amplitude.com/analytics/apis/dashboard-rest-api/?h=dashboard#event-format

Under 'filters', change the phrase to:

subprop_type Required. Either "event", "user" or "derivedV2", indicating that the property is either an event, user or derived property, respectively.

Under 'grouped by', change the phrase to:

type Required. - Either "event", "user" or "derivedV2", indicating that the property is either an event, user property or derived property, respectively.

Which page needs an update?

https://www.docs.developers.amplitude.com/analytics/apis/dashboard-rest-api/?h=dashboard#event-format