Hopefully help 'technical minecrafters' find and understand these configs
by adding notes to them, and fixing the incorrect config placement on the
bedrock config.
The 2 flag (send change to clients) must always be set. If it is only set
when the `map.replace` call before it does something, as was suggested
on Discord, the issue will not change whatsoever.
Fixes#3593
This renames the config from enable tnt duping to enable piston duping
Normally we would not have a config for rails and carpet duping, but
the fix for TNT is the same fix for rails and carpet, so they are
having to be covered under that same config.
