2 more weeks of flowering help asap wat is this brown stuff

whats up with it its a bubba kush clone medshop 1212 flowering gna b 3 months old

Is the leaf dry and crispy where the affected area is?

And where about on the plant is it?

look like it have been to close to the light .. or if its bottom grow .. been under watered at some point ? dunno .. is it on all the leafs ? if its only on that one don't worry .. maybe remove it and keep a eye on the plant .. if you only have two weeks left I doubt any def. or bug can do mouch damages ..

Its in the middle leaves the large clone leaves

Boron deficiency since people are skeptical about foliar feeding in flowering i can't recommend it although i do,but water with anything that has boron in it even water lol
so any one of these product tsp per gallon will work Borax, Boric Acid, Colemanite, Sodium pentaborate, Sodium tetraborate,it's the last 2 weeks i wouldn't worry much.

Slipon is right its light burn.

You decide pic 1 is heat stress and pic 2 of boron deficiency