blk-wbt: Remove obsolete multiqueue I/O scheduling comment

This comment was added before the multiqueue I/O scheduler framework
was introduced; multiqueue has support for I/O scheduling now, so this
obsolete comment can be removed.

Signed-off-by: Danny Lin <danny@kdrag0n.dev>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

block/Kconfig

@@ -161,8 +161,6 @@ config BLK_WBT_MQ
 	depends on BLK_WBT
 	help
 	Enable writeback throttling by default on multiqueue devices.
-	Multiqueue currently doesn't have support for IO scheduling,
-	enabling this option is recommended.
 
 config BLK_DEBUG_FS
 	bool "Block layer debugging information in debugfs"