Update f22/andy_lec_notes/lec07_Sep21_FunctionScope/readme.md

Deleted f22/andy_lec_notes/lec_07/.ipynb_checkpoints/lec07_function_scope_850-checkpoint.ipynb, f22/andy_lec_notes/lec_07/.ipynb_checkpoints/lec_07_850-checkpoint.ipynb, f22/andy_lec_notes/lec_07/.ipynb_checkpoints/lec_07_writing_functions_template-checkpoint.ipynb, f22/andy_lec_notes/lec_07/lec_07_writing_functions_template.ipynb, f22/andy_lec_notes/lec_07/lec07_function_scope_850.ipynb