Disc is typo.

Correct:
"Disk space"

Incorrect
"Disc space"

Some identical typos are seen on this page.

Reported by: rhn-support-kyoneyam

https://access.redhat.com/documentation/en-us/red_hat_directory_server/11/html/release_notes/general_information#annotations:b731b8ee-62d9-43fe-ab28-d5770e6f6ab3