minor docs fix #344

Job	Run time
Documentation	9m 6s
Julia 1.6 - ubuntu-latest - x64 - push	11m 39s
Julia 1.6 - ubuntu-latest - x86 - push	14m 19s
Julia 1.6 - macOS-latest - x64 - push	14m 45s
Julia 1.6 - windows-latest - x64 - push	27m 13s
Julia 1.6 - windows-latest - x86 - push	25m 16s
Julia 1 - ubuntu-latest - x64 - push	12m 25s
Julia 1 - ubuntu-latest - x86 - push	14m 31s
Julia 1 - macOS-latest - x64 - push	11m 30s
Julia 1 - windows-latest - x64 - push	16m 10s
Julia 1 - windows-latest - x86 - push	16m 13s
Julia nightly - ubuntu-latest - x64 - push	1m 53s
Julia nightly - ubuntu-latest - x86 - push	2m 21s
Julia nightly - macOS-latest - x64 - push	3m 11s
Julia nightly - windows-latest - x64 - push	4m 28s
Julia nightly - windows-latest - x86 - push	8m 29s
	3h 13m 29s

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