Describe in the documentation of STAR wrapper how to use shared memory

[moxgreen]

I know that shared memory can be used in combination with STAR wrapper, as described here #420.
But I no not know how to do that. Unfortunately also the documentation here is not clear for me https://snakemake.readthedocs.io/en/stable/snakefiles/rules.html#service-rules-jobs

A toy snakefile example using STAR wrapper and shared memory would be very useful.

Thanks.