Greetings. I'm currently in week 6 of flower and woke up this morning to yellow spots on some of my fan leaves. The majority of the leaves tips are yellow as well. I appreciate the help!
Big brown spots are water or light contact burns. The brown tip is nitrogen deficiency. This is not only normal but good in the 6th week (assuming 8 week flower) of flower. The plant is cannibalizing the veg to feed the flower. Sign of early flush.