Try to better HealthCheckProgram use

doc/man/man5/slurm.conf.5

@@ -606,14 +606,15 @@ The default value is zero, which disables execution.
 .TP
 \fBHealthCheckProgram\fR
 Fully qualified pathname of a script to execute as user root periodically
-on all compute nodes that are not in the NOT_RESPONDING state. This may be
-used to verify the node is fully operational and DRAIN the node or send email
-if a problem is detected.
+on all compute nodes that are \fBnot\fR in the NOT_RESPONDING state. This
+program may be used to verify the node is fully operational and DRAIN the node
+or send email if a problem is detected.
 Any action to be taken must be explicitly performed by the program
 (e.g. execute
 "scontrol update NodeName=foo State=drain Reason=tmp_file_system_full"
 to drain a node).
-The interval is controlled using the \fBHealthCheckInterval\fR parameter.
+The execution interval is controlled using the \fBHealthCheckInterval\fR
+parameter.
 Note that the \fBHealthCheckProgram\fR will be executed at the same time
 on all nodes to minimize its impact upon parallel programs.
 This program is will be killed if it does not terminate normally within