I've waited more than a few minutes and they still aren't showing up
Very rarely, but on occasion, Github Pages runs into a problem and doesn't upload the changes. You can check this by going to https://github.com/adafruit/circuitpython-org, going to the Settings tab, if you have access, and scrolling down to the Github Pages section to check for an error.
Submitting a new PR will cause it to repair itself. If you want to submit an empty Pull Request (no changes), you can first create an empty commit with the following command:
git commit --allow-empty -m "Trigger GHPages Rebuild"
You can change the message to be whatever is appropriate. After that, submit a new Pull Request.
There are some Unknown boards showing up in addition to the board I added
If the new board you added is showing up and there is also an existing ID for your board, make sure to use that first. To find the ID, Right-click on the Unknown board and choose Inspect. Look for the data-id tag to get the board ID.