build: Remove documentation lies from 'copy' task
build: Remove documentation lies from 'copy' task

These were accidentally copied from the 'concat' task.

Change-Id: Iaac04ab2142bab35a656737c2222a0c76105e13d

wikimedia/oojs-ui,wikimedia/oojs-ui,wikimedia/oojs-ui,wikimedia/oojs-ui