Better error when releasing displays would help

[dhalbert]

If the user forgets to do a displayio.release_displays() at the top of the program, the program might raise Too many display busses. This error does not mean a lot to the average user: perhaps it should also say Did you forget displayio.release_displays(), or check for that case and print a better error.

From a thread in discord, starting here:
https://discord.com/channels/327254708534116352/537365702651150357/1129271113931829359