Have an urgent need to touch-up a photo for a memorial. Using MacBook Pro with Monterey. Photo is a black-and-white image that has some white spots where it is suppose to be black/gray. Somewhere somehow in the past I believed I experimented with a tool within Photos where I could use some kind of brush/marker to outline the spot to be adjusted then somehow change that spot to color of the surrounding area. I did that once on my old MacBook Air years ago, and now (age related, I'm sure) I have zero idea how I did it then or how to do it now. Have checked YouTube videos but no luck. Anyone please?!?