btrfs: update the Kconfig string for CONFIG_BTRFS_EXPERIMENTAL

The following new features are missing:

- Async checksum

- Shutdown ioctl and auto-degradation

- Larger block size support
Which is dependent on larger folios.

Signed-off-by: Qu Wenruo <[e-mail]>
Reviewed-by: David Sterba <[e-mail]>
Signed-off-by: David Sterba <[e-mail]>

fs/btrfs/Kconfig

···
 
 	  - extent tree v2 - complex rework of extent tracking
 
-	  - large folio support
+	  - large folio and block size (> page size) support
+
+	  - shutdown ioctl and auto-degradation support
+
+	  - asynchronous checksum generation for data writes
 
 	  If unsure, say N.