docs: remove left overs in /dev/mapper/ceph--*
docs: remove left overs in /dev/mapper/ceph--*

During Ceph teradown these files also need to be removed as well.

This is a continuation of the closed PR #7395.

Signed-off-by: Alexander Trost <88b6b84d9fa0dbf878e34ae3d402bc4895fcd37e@googlemail.com>

rook/rook,rook/rook,rook/rook,rook/nfs,rook/rook,rook/nfs,rook/nfs,rook/rook