danielg4:
Is there a process in place yet to migrate individual pages to the Tutorials or ProjectHub for further edits?
It would be just as difficult getting edits done in the Tutorials section, since that also requires someone at Arduino with write access to implement your requested changes. In fact it would likely be more difficult since the Arduino employee will need to carefully review any changes made to a tutorial page to make sure it is something Arduino approves of.
You are welcome to create a page on Arduino Project Hub and publish your content there. It would be best for you to do this yourself so that you will have write access to that project. I do think it's very unfortunate to have content duplicated between the Playground and Project Hub. If you end up doing that, I would recommend that you request the Playground page be replaced with a link to your Project Hub project.
As for requesting edits to the Arduino Playground, I would recommend opening an issue report in the arduino/Arduino issue tracker:
I can't make any promises that will result in a fast resolution, but at least in the tracker your request won't get lost like it will here on the forum.