fix benchmark links (#1092)

Meng Wei

2023-11-15 12d694f94cb4d25ee9a981a16f9197e4bb13b4eb

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p m    p.m.
pm    p.m.
p.m.
p.m    p.m.
am    a.m.
a.m.
a.m    a.m.
a m    a.m.