MdeModulePkg: ScsiDiskDxe: clean up comment in ScsiDisk.c

MdeModulePkg: ScsiDiskDxe: clean up comment in ScsiDisk.c

Comment of MdeModulePkg/Bus/Scsi/ScsiDiskDxe/ScsiDisk.c was polluted by
some previous merge. This patch clean it up.

Cc: Ard Biesheuvel <ardb+tianocore@kernel.org>
Cc: Liming Gao <gaoliming@byosoft.com.cn>
Cc: Hao A Wu <hao.a.wu@intel.com>
Cc: Ray Ni <ray.ni@intel.com>
Cc: Sivaparvathi chellaiah <sivaparvathic@ami.com>
Signed-off-by: Yuan Yu <yuanyu@google.com>
Reviewed-by: Hao A Wu <hao.a.wu@intel.com>