MdePkg/UefiScsiLib: Wrong function parameter comments in UefiScsiLib. It should be the number of transferred blocks rather than block size.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Tian, Feng <feng.tian@intel.com>
Reviewed-by: Zeng, Star <star.zeng@intel.com>
Reviewed-by: Fu, Siyuan <siyuan.fu@intel.com>

git-svn-id: svn://svn.code.sf.net/p/edk2/code/trunk/edk2/MdePkg@15492 6f19259b-4bc3-4df7-8a09-765794883524