docs: correct wrong information about indexing (#1087) #5067

Job	Run time
lantern / os:macOS \| v:cpu-intel (pre-cxx11: 0)	6m 6s
lantern / os:macOS \| v:cpu-m1 (pre-cxx11: 0)	1m 19s
lantern / os:ubuntu \| v:cpu (pre-cxx11: 0)	5m 59s
lantern / os:ubuntu \| v:cpu (pre-cxx11: 1)	7m 43s
lantern / os:ubuntu \| v:cu11.7 (pre-cxx11: 0)	22m 0s
lantern / os:ubuntu \| v:cu11.7 (pre-cxx11: 1)	18m 55s
lantern / os:windows \| v:cpu (pre-cxx11: 0)	13m 8s
lantern / os:windows \| v:cu11.7 (pre-cxx11: 0)	31m 4s
macOS R: release - cpu-intel (pre-cxx11: )	34m 8s
macOS R: - cpu-m1 (pre-cxx11: )	8m 24s
ubuntu R: release - cpu (pre-cxx11: )	43m 21s
centos R: - cpu (pre-cxx11: 1)	34m 27s
ubuntu R: release - cu11.7 (pre-cxx11: )	28m 28s
windows R: release - cpu (pre-cxx11: )	32m 24s
windows R: 3.6 - cpu (pre-cxx11: )	33m 29s
	5h 20m 55s

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