docs: Fix typo in RAID data volume mount unit
docs: Fix typo in RAID data volume mount unit

coreos/ignition,ajeddeloh/ignition,ajeddeloh/ignition,coreos/ignition,dgonyeo/ignition,AlexNPavel/ignition,higebu/ignition,higebu/ignition,higebu/ignition,ajeddeloh/ignition,coreos/ignition,dgonyeo/ignition,AlexNPavel/ignition,AlexNPavel/ignition,dgonyeo/ignition