docs: fix 'Missing $ inserted.'

Signed-off-by: Adrian Reber <[email protected]>

docs/recipes/install/leap15/x86_64/warewulf/slurm/manifest/perf-tools2.tex

@@ -25,7 +25,7 @@
 
 % <-- begin entry for msr-safe-ohpc-kmp-default
 \multirow{2}{*}{msr-safe-ohpc-kmp-default} &
-\multirow{2}{*}{1.6.0_k5.3.18_57} &
+\multirow{2}{*}{1.6.0\_k5.3.18\_57} &
 Allows safer access to model specific registers (MSRs). \newline { \color{logoblue} \url{https://github.com/LLNL/msr-safe}}
 \\ \hline
 % <-- end entry for msr-safe-ohpc-kmp-default