Make the desc wording of "optional" settings similar

[RedstoneFuture]

This is a small typographical revision so that the optional setting starts the same (optional) prefix everywhere.

# (optional) if true, color codes in player display names are used
use-name-colors: false
[...]
#  # (Optional) if true, players that are crouching/sneaking will be hidden 
hideifsneaking: false
[...]
# Optional: send push button
sendbutton: false
[...]
# Optional - hide ores: render as normal stone (so that they aren't revealed by maps)
#hideores: true