Deprecate field `regions` in GuildEdit and the view of the value

Created by: Lulalaby

If https://github.com/discord/discord-api-docs/pull/2982 get's approved, we need to remove the region field in Guilds. Or it will be in a new version bumb, we'll see

Thing is: The field is not used anymore. It's still there, but unnecessary. I would like to hide it.