Documentation about `memory` vs 'job_mem` could be improved

[Andrew-S-Rosen]

The SLRUMCluster documentation's description for the memory keyword argument is a bit ambiguous when comparing against job_mem.

We have:

• memory: Total amount of memory per job
• job_mem: Amount of memory to request in SLURM. If None, defaults to worker processes * memory

The documentation states that a "job" is a Slurm allocation. So, this leads us to some potentially confusing docs.

[guillaumeeb]

You are right, this is the memory documentation that is correct, but not precise enough, this should be something like:

• memory: Total amount of memory to be used by all workers inside a job. Used by job queuing system by default as amount of memory per job.
• job_mem: Amount of memory to request in SLURM for each job, If None, defaults to memory.