Reading "Music Theory for Guitar An Introduction to the Essentials"

I try to do the intervals exercises

I am pretty sure these are two errors

• it should be M7 not m7 it is a full 7 interval with no modification, so major

• it should be m2 not 2+ the sharp reduces the interval, so + makes no sense

otherwise then I just don't get it

any help from the pros ? thanks for taking time to explaining where/if I am wrong