Update config.yml

Made comments more clearer and cleaner, IMO comments on the same line as the actual config can mess things up.

Also, setting the vanilla "world" as a world that is disabled is a *bad* idea, because most people who don't bother with configs will claim that the plugin is not working, so it should be just changed to a "world_example".
Update config.yml
Merge pull request #1 from xbenas/patch-1

Update config.yml