doc/cephfs: remove link to undeveloped tool

Remove a link to a tracker for a planned-but-never-developed tool that
would have facilitated the importation or exportation of a RADOS pool to
a file. This is a part of a project to improve the CephFS Disaster
Recovery documentation, which was requested by Eugen Block. See the
tracker issue below for more on this project.

Follows ceph#61411

See ceph#61411 (comment)

https://tracker.ceph.com/issues/69557

Signed-off-by: Zac Dover <[email protected]>

Author: zdover23

doc/cephfs/disaster-recovery-experts.rst

@@ -28,11 +28,6 @@ running the following command:
 
    cephfs-journal-tool journal export backup.bin
 
-If the journal is badly corrupted, this command might not work. If the journal
-is badly corrupted, make a RADOS-level copy
-(http://tracker.ceph.com/issues/9902).
-
-
 Dentry recovery from journal
 ----------------------------