Add a SLURM example with minimal config (#2950)
* Add an example with minimal config
* Improve
* Even more minimal
* Rm slurm arg
* Update examples/slurm/submit_multinode_fsdp.sh
Co-authored-by: Marc Sun <57196510+SunMarc@users.noreply.github.com>
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Co-authored-by: Marc Sun <57196510+SunMarc@users.noreply.github.com>
