salloc, sattach, sbcast, sdiag, sprio, sshare, strigger, sview, sh5util, scrun, scrontab: add pages (#11651)

pages/linux/scrontab.md

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+# scrontab
+
+> Manage Slurm crontab files.
+> More information: <https://slurm.schedmd.com/scrontab.html>.
+
+- Install a new crontab from the specified file:
+
+`scrontab {{path/to/file}}`
+
+- [e]dit the crontab of the current user:
+
+`scrontab -e`
+
+- [e]dit the crontab of the specified user:
+
+`scrontab --user={{user_id}} -e`
+
+- [r]emove the current crontab:
+
+`scrontab -r`
+
+- Print the crontab of the current user to `stdout`:
+
+`scrontab -l`