Im not sure. I think the graph page having the graph desc is clear.
I could see the job page showing both (hiding when None) which would imply not inheriting
I could see the job page just showing just job desc which would support inheriting.
Should we start here without and change it to add later based on dagit iteration?
My intuition would be that we would default to the graph's desc, and the desc arg on to_job would act as an override almost.