1st time/ auto/ grow dots

Yoo ! Doesnt look like burnt to me, I’d say it’s lacking in phosphorus or maybe calcium. Nutrients burn make the tip of your leaf going yellow and bending up and can go all around the leaves. Good luck

I have not heard the phrase "84 and door" before but it sounds neat, I don't think its a golden rule though. Your plants are looking a bit overfeed at the moment and that discoloration could be from a bit of a salt buildup in the soil locking out some nutrients or a lack of some other nutrient not related to a buildup. Its mimicking Potassium deficiency, Also to much Nitrogen as Nh4 with low amount of NO3 will lock out potassium. magnesium and calcium. This is what its looking like to me, but play aorund with your nutrients and maybe lessen up on the N and try and get some runoff with your next water to leach some of it out. Be careful not to water to fast with soil as it can compact it and cause other issues. Good Luck!

No that's not nutrient burn. It's on the lower leaves and it's more a natural looking fade or senescence. Your plants look good.