docs: remove now-duplicate comment for NHC
% begin_ohpc_run
% ohpc_validation_newline
-% ohpc_validation_comment Optionally, enable nhc and configure
\begin{lstlisting}[language=bash,keywords={},upquote=true]
# Register as SLURM's health check program
[sms](*\#*) echo "HealthCheckProgram=/usr/sbin/nhc" >> /etc/slurm/slurm.conf
