What are the brown spots on leaves from?

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Why worry, your plant is so close to harvest, nothing you do will fix this before harvest time. I would say it could be mould/fungus if your humidity is too high. Nice job though.

This is either a calcium or manganese deficiency and you really don't, it seems to me, have time to figure out which one (you could add some calmag if it's calcium but then you'd have to wait to see if new leaves exhibit the same issue). If it's a manganese deficiency, then your PH is not in the range for the plant to pick up this vital micronutrient... so here's what I would recommend... flush your plant with ph'd water (you want to run 3-times the pot size of water through the plant so if you're growing in a 3 gallon pot, you'd run 9 gallons of ph'd water through). Check the PH of the runoff - it should be between 6.0 and 6.5 with 6.3 being the "sweet spot" ... when you've done that and the runoff PH is in that range, you can run another gallon of water with nutes through - but make sure the nutes contain manganese and calcium (read the label!). The next time you feed, add some calmag. Only use calmag once a week IF NEEDED... If you don't have a PH pen, this is probably the single most important tool you can have when growing weed so definitely invest in one.... I like Apera - it's as good as, if not better than Blue Lab which is touted as the "gold standard" .... Good luck!

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Umm honestly it looks like your plant is nitrogen deficient, speaking of nitrogen deficient it looks like your plant is going thru a flush at the end weeks of flower . If that’s the case no worries but if you’re not flushing the plant & are sure nitrogen levels aren’t an issue, it may be a potassium deficiency especially being during flower

Manganese deficiency. Not to be confused with magnesium. Could be several causes. To many nuturents causing a lockout. Lack of nuturents or just that single one. Incorrect pH preventing the plant from absorbing it. Water with pH water until runoff test the water(ec/pH) to see what your issue is. Good luck and happy Growing