API documentation should show package name

[Paul Oswald]

Throughout the API, it can be very difficult to know which package you need to import to get access to a class or function. Often this is encoded into the permalink but not visible on the page. For example the anchor is:

​https://docs.djangoproject.com/en/dev/ref/forms/fields/#django.forms.Field

but the class is described as:

class Field(kwargs)

I think it would be best to list it as:

class django.forms.Field(kwargs)

Or at least put the package name as a section header. I imagine there's a way to make the documentation do this site-wide or at least for the API section?

[Tim Graham]

Duplicate of #15396