slurm*: add pages (#11133)

Author:    xuzhangheng <48378279+xuzhangheng@users.noreply.github.com>
Co-authored-by: Magrid <magrid0@proton.me>
Co-authored-by: K.B.Dharun Krishna <kbdharunkrishna@gmail.com>

pages/linux/slurmstepd.md

@@ -0,0 +1,9 @@
+# slurmstepd
+
+> Slurm daemon for managing and monitoring individual job steps within a multi-step job.
+> It should not be invoked manually.
+> More information: <https://slurm.schedmd.com/slurmstepd.html>.
+
+- Start the daemon:
+
+`slurmstepd`