Dont include code blocks on "The Predefined Trait Editor Factories" page in docs

Currently on https://docs.enthought.com/traitsui/traitsui_user_manual/factories_basic.html#, there seems to be some editors in which code is included and others where it isn't. We should probably just link to the examples themselves that were used generate the screenshot rather than clouding that page.
Whatever we chose to do, we should aim to be consistent.