Use ibexa_content::viewAction w/ two colons

`Controller "ibexa_content:viewAction" does neither exist as service nor as class.`

See https://doc.ibexa.co/en/5.0/release_notes/ibexa_dxp_v5.0_deprecations/#ibexacore "Dropped single colon notation"

Author: adriendupuis

docs/infrastructure_and_maintenance/request_lifecycle.md

@@ -130,7 +130,7 @@ Now, when the `Request` knows its controller, the `HttpKernel` dispatches the `k
 When HttpKernel dispatches the `kernel.controller` event, the following things happen.
 
 Listening to `kernel.controller`, the `ViewControllerListener` (`Ibexa\Bundle\Core\EventListener\ViewControllerListener`) (priority 10) checks if the `_controller` request attribute is associated with a `ViewBuilder` (a service tagged `ibexa.view.builder`) in the `ViewBuilderRegistry` (`Ibexa\Core\MVC\Symfony\View\Builder\Registry\ControllerMatch`).
-The `ContentViewBuilder` (`Ibexa\Core\MVC\Symfony\View\Builder\ContentViewBuilder`) matches on controller starting with `ibexa_content:` (see `Ibexa\Core\MVC\Symfony\View\Builder\ContentViewBuilder::matches`).
+The `ContentViewBuilder` (`Ibexa\Core\MVC\Symfony\View\Builder\ContentViewBuilder`) matches on controller starting with `ibexa_content::` (see `Ibexa\Core\MVC\Symfony\View\Builder\ContentViewBuilder::matches`).
 The `ContentViewBuilder` builds a `ContentView`.
 
 First, the `ContentViewBuilder` loads the `Location` and the `Content`, and adds them to the `ContentView` object.