Looks like little burns to me. Could be from tap water or fertilizers? Not a big deal though. Outdoor plants are exposed to a lot so leaves get chewed up and damaged sometimes. I notice your leaves are getting a little yellow in between the veins. If you are not overwatering and your pH is good then this is a definitely sign of magnesium deficiency. A little Epsom salt or calmag would clear it up pretty quick. Good luck on the rest of your grow