docs: fix section numbering error in syzos.md #18742

Job	Run time
build	4m 17s
race_dashboard	2m 58s
aux	4m 19s
dashboard	2m 6s
gvisor	4m 7s
race	7m 19s
old	7m 2s
arch (presubmit_arch_linux)	10m 34s
arch (presubmit_arch_darwin)	3m 54s
arch (presubmit_arch_netbsd)	3m 56s
arch (presubmit_arch_openbsd)	4m 5s
arch (presubmit_arch_executor)	3m 22s
arch (presubmit_arch_freebsd)	6m 27s
arch (presubmit_arch_windows)	3m 48s
	1h 8m 14s

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