Update the help information of GenBootSector according to EDK II Tools Design Spec
Update the help information of GenBootSector according to EDK II Tools Design Spec

Signed-off-by: Yuxin Zheng <yuxin.zheng@intel.com>
Reviewed-by: Liming Gao <liming.gao@intel.com>

git-svn-id: f3880c1fc5096ce2109c8aec392d8e07f619f417@2574 c2973edb-eda0-4c78-bc6a-9341b269661f

tianocore/buildtools-BaseTools,tianocore/buildtools-BaseTools,bitcrystal/buildtools-BaseTools,bitcrystal/buildtools-BaseTools,bitcrystal/buildtools-BaseTools,tianocore/buildtools-BaseTools,tianocore/buildtools-BaseTools,bitcrystal/buildtools-BaseTools,tianocore/buildtools-BaseTools,bitcrystal/buildtools-BaseTools