perf stat: Elaborate use cases for the -n/--null command line option
The existing text was way too terse, pick the intended usage from the
cset that introduced this option.
Twitter: https://twitter.com/_monoid/status/1371461130175004672?s=20
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
parent
5497b23e
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