Update example in help on --zjit-stats #1814

Job	Run time
benchmark-default (truffleruby, --excludes=knucleotide,lobsters,ruby-lsp,shipit)	13m 23s
test (head)	4m 48s
benchmark-run-once	1m 39s
test (ruby)	53s
benchmark-default (head)	12m 12s
benchmark-ractor (head)	6m 44s
benchmark-graph	46s
test (truffleruby)	1m 59s
benchmark-default (ruby)	11m 26s
benchmark-ractor-only (head)	41s
all-tests	3s
	54m 34s

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