fix docs: fix SingleConsumerEvent docs formatting #6396

Job	Run time
ubuntu-24.04: gcc-13 + release	24m 35s
ubuntu-22.04: clang-14 + debug + sanitize addr+ub	32m 20s
ubuntu-22.04: g++-9 + release	33m 26s
ubuntu-24.04: clang-18 + debug + sanitize addr+ub	26m 9s
	1h 56m 30s

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