[PATCH] btrfs-progs: docs: mark "usebackuproot" mount option as removed

Since the kernel patch is going to land in v7.3, update the man page to
reflect that change.

Also, just in case end users are using the latest progs but on a much
older kernel, keep the "usebackuproot" mount option entry, but
explicitly mark it as "removed", along with the history of deprecation.

Signed-off-by: Qu Wenruo <[email protected]>
---
 Documentation/ch-mount-options.rst | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/Documentation/ch-mount-options.rst b/Documentation/ch-mount-options.rst
index 8f65b8311e7e..8dac29d8aa52 100644
--- a/Documentation/ch-mount-options.rst
+++ b/Documentation/ch-mount-options.rst
@@ -462,14 +462,15 @@ treelog, notreelog
         a mounted filesystem if the log is not replayed.
 
 usebackuproot
-        (since: 4.6, default: off)
+        (since: 4.6, removed since: 7.3, default: off)
 
         Enable autorecovery attempts if a bad tree root is found at mount time.
         Currently this scans a backup list of several previous tree roots and tries to
         use the first readable. This can be used with read-only mounts as well.
 
         .. note::
-                This option has replaced *recovery* which has been deprecated.
+		This option has replaced *recovery* which has been deprecated in v5.9.
+		This option is fully removed since v7.3.
 
 user_subvol_rm_allowed
         (default: off)
-- 
2.54.0