btrfs-progs: docs: update feature status

[ci skip]

Signed-off-by: David Sterba <[email protected]>

Author: kdave

Documentation/Status.rst

@@ -13,7 +13,7 @@ in meeting your performance expectations for your specific workload.
 Combination of features can vary in performance, the table does not
 cover all possibilities.
 
-**The table is based on the latest released linux kernel: 6.9**
+**The table is based on the latest released linux kernel: 6.11**
 
 The columns for each feature reflect the status of the implementation
 in following ways: