Add @Event documentation to all RenderEvents

This issue is for adding the @Event tag and appropriate documentation to the following list of events.

$this->eventDispatcher->dispatch(RenderEvents::SELECT_PAGE_DISPLAY_VARIANT, $event);

This documentation should include the following information:

- What the event is
- What it is used for
- What kind of $event object is passed along.
- @see links to related classes (event class, representative class where event is dispatched, representative class where event is subscribed to).

See the parent issue for a documentation template, and more information: #2382169: [meta] Add @Event to all events defined by drupal core