Provide consistent experience of status code in api description when an action returns a DTO vs void

[kichalla]

Current Behavior
For this action an apidescription would have status code information as 200 OK

public Product Get()

For this action we do NOT provide a response type description(which contains status code info)

public void DoSomething()

From here:
#4831 (comment)

cc @rynowak

[Eilon]

Should void result in a 204 status code automatically?

[rynowak]

This breaks the MVC. We tried this earlier

Suggestion here is to do 200 by default because that's the actual default. More discussion here: domaindrivendev/Swashbuckle.AspNetCore#97

[Eilon]

Ah sure.

[Eilon]

@jbagga - please remove "Working" and add "Done" - thanks!