small typo: in Week 14 lecture, section 15.3.1 Do: "validatioN”

[samanwoy1989]

Dear Professor @jtleek thank you for yet again an amazing lecture and one that was needed most. However in the section

15.3.1 Do the 3rd point starting with: "Be specific. A reviewing relationship . . . ." seems to have a typo of "N" being uppercase in the word validatioN .

Thanks