docs: update reproduction instructions #14562

Job	Run time
arch (presubmit_arch_linux)	10m 46s
dashboard	2m 41s
arch (presubmit_arch_freebsd)	6m 57s
arch (presubmit_arch_netbsd)	4m 25s
build	11m 20s
aux	4m 39s
arch (presubmit_arch_openbsd)	4m 15s
race	8m 3s
race_dashboard	3m 15s
arch (presubmit_arch_darwin)	4m 18s
arch (presubmit_arch_windows)	3m 26s
gvisor	4m 21s
arch (presubmit_arch_executor)	3m 16s
old	7m 6s
	1h 18m 48s

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