Documentation: filesystems: Fix stale reference to device-mapper docs

Commit 6cf2a73 ("docs: device-mapper: move it to the admin-guide")
moves device mapper docs to Documentation/admin-guide, but left
references (which happen to be external ones) behind, hence 404 when
clicking them.

Fix the references while also converting them to internal ones.

Signed-off-by: Bagas Sanjaya <[email protected]>

Author: bagasme

Documentation/filesystems/fsverity.rst

@@ -15,12 +15,11 @@ of read-only files.  Currently, it is supported by the ext4, f2fs, and
 btrfs filesystems.  Like fscrypt, not too much filesystem-specific
 code is needed to support fs-verity.
 
-fs-verity is similar to `dm-verity
-<https://www.kernel.org/doc/Documentation/admin-guide/device-mapper/verity.rst>`_
-but works on files rather than block devices.  On regular files on
-filesystems supporting fs-verity, userspace can execute an ioctl that
-causes the filesystem to build a Merkle tree for the file and persist
-it to a filesystem-specific location associated with the file.
+fs-verity is similar to :doc:`dm-verity
+</admin-guide/device-mapper/verity>` but works on files rather than block
+devices.  On regular files on filesystems supporting fs-verity, userspace can
+execute an ioctl that causes the filesystem to build a Merkle tree for the file
+and persist it to a filesystem-specific location associated with the file.
 
 After this, the file is made readonly, and all reads from the file are
 automatically verified against the file's Merkle tree.  Reads of any

Documentation/filesystems/ubifs-authentication.rst

@@ -439,9 +439,9 @@ References
 
 [DMC-CBC-ATTACK]     https://www.jakoblell.com/blog/2013/12/22/practical-malleability-attack-against-cbc-encrypted-luks-partitions/
 
-[DM-INTEGRITY]       https://www.kernel.org/doc/Documentation/device-mapper/dm-integrity.rst
+[DM-INTEGRITY]       Documentation/admin-guide/device-mapper/dm-integrity.rst
 
-[DM-VERITY]          https://www.kernel.org/doc/Documentation/device-mapper/verity.rst
+[DM-VERITY]          Documentation/admin-guide/device-mapper/verity.rst
 
 [FSCRYPT-POLICY2]    https://lore.kernel.org/r/[email protected]/