Added support for show job step (incomplete) to scontrol.

doc/man/man1/scontrol.1

@@ -53,13 +53,16 @@ such as the addition of memory or processors. Running jobs continue execution.
 .TP
 \fIshow\fP \fIENTITY\fP \fPID\fP
 Display the state of the specified entity with the specified identification.
-\fIENTITY\fP may be \fIconfig\fP, \fIjob\fP, \fInode\fP or \fIpartition\fP.
+\fIENTITY\fP may be \fIconfig\fP, \fIjob\fP, \fInode\fP, \fIpartition\fP
+or \fIstep\fP.
 \fIID\fP can be used to identify a specific element of the identified 
-entity: the configuration parameter name, job ID, node name or partition name for 
-entities \fIconfig\fP, \fIjob\fP, \fInode\fP and \fIpartition\fP respectively. 
+entity: the configuration parameter name, job ID, node name, partition name, 
+or job step ID for entities \fIconfig\fP, \fIjob\fP, \fInode\fP, \fIpartition\fP, 
+and \fIstep\fP respectively. 
 Multiple node names may be specified using simple regular expressions 
 (e.g. "lx[10-20]"). All other \fIID\fP values must identify a single 
-element. By default, all elements of the entity type specified are printed.
+element. The job step ID is of the form "job_id.step_id", (e.g. "1234.1").
+By default, all elements of the entity type specified are printed.
 .TP
 \fIshutdown\fP
 Instruct the Slurm controller to terminate.