docs: sysfs-block: add contact for nomerges

The nomerges file was missing a "Contact" entry.  Use linux-block.
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Eric Biggers <ebiggers@google.com>
Link: https://lore.kernel.org/r/20211209003833.6396-4-ebiggers@kernel.orgSigned-off-by: Jens Axboe <axboe@kernel.dk>

Documentation/ABI/stable/sysfs-block

@@ -242,7 +242,7 @@ Description:
 
 What:		/sys/block/<disk>/queue/nomerges
 Date:		January 2010
-Contact:
+Contact:	linux-block@vger.kernel.org
 Description:
 		Standard I/O elevator operations include attempts to
 		merge contiguous I/Os. For known random I/O loads these