update tcl based on PR comments
update tcl based on PR comments

Signed-off-by: mgwoo <32e4b6b9d9072198eed6629e61332663aceefcf1@eng.ucsd.edu>

The-OpenROAD-Project/OpenROAD,QuantamHD/OpenROAD,The-OpenROAD-Project/OpenROAD,The-OpenROAD-Project/OpenROAD,QuantamHD/OpenROAD,QuantamHD/OpenROAD,The-OpenROAD-Project/OpenROAD,QuantamHD/OpenROAD,QuantamHD/OpenROAD,The-OpenROAD-Project/OpenROAD