nixos/buffyboard: fix DE integration docs for 3.5.1

# Desktop users are recommended to either:

# 1. Stop buffyboard once your DE is started.

#   e.g. `services.buffyboard.unitConfig.Conflicts = [ "my-de.service" ];`

# 2. Configure your DE to ignore input events from buffyboard (product-id=25209; vendor-id=26214; name=rd)

#   e.g. `echo 'input "26214:25209:rd" events disabled' > ~/.config/sway/config`

# 2. Configure your DE to ignore input events from buffyboard (product-id=0; vendor-id=0; name=buffyboard)

#   e.g. `echo 'input "0:0:buffyboard" events disabled' > ~/.config/sway/config`

{

  config,