sacct, scancel, srun: add page (#4600)

pages/linux/sacct.md

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+# sacct
+
+> Display accounting data from the Slurm service.
+> More information: <https://slurm.schedmd.com/sacct.html>.
+
+- Display job id, job name, partition, account, number of allocated cpus, job state, and job exit codes for recent jobs:
+
+`sacct`
+
+- Display job id, job state, job exit code for recent jobs:
+
+`sacct --brief`
+
+- Display the allocations of a job:
+
+`sacct --jobs {{job_id}} --allocations`
+
+- Display elapsed time, job name, number of requested CPUs, and memory requested of a job:
+
+`sacct --jobs {{job_id}} --format={{elapsed}},{{jobname}},{{reqcpus}},{{reqmem}}`

pages/linux/scancel.md

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+# scancel
+
+> Cancel a Slurm job.
+> More information: <https://slurm.schedmd.com/scancel.html>.
+
+- Cancel a job using its ID:
+
+`scancel {{job_id}}`
+
+- Cancel all jobs from a user:
+
+`scancel {{user_name}}`

pages/linux/srun.md

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+# srun
+
+> Create an interactive slurm job or connect to an existing job.
+> More information: <https://slurm.schedmd.com/srun.html>.
+
+- Submit a basic interactive job:
+
+`srun --pty /bin/bash`
+
+- Submit an interactive job with different attributes:
+
+`srun --ntasks-per-node={{num_cores}} --mem-per-cpu={{memory_MB}} --pty /bin/bash`
+
+- Connect to a worker node with a job running:
+
+`srun --jobid={{job_id}} --pty /bin/bash`