TYP: changed variable from vals to array_vals in pandas/core/indexes/multi.py
xref #37715

Changed variable name from vals to array_vals in pandas/core/index/multi.py: 705 and 706 
To remove type: ignore[assignment] mypy error

Changed variable name from m to mapped_result in pandas/core/index/multi.py: 3121
Removed type: ignore[assignment] mypy error in line 3126 and 3131