Small docstring fix (#248) #337

Job	Run time
Documentation	2m 25s
Julia lts - windows-latest - default - push	1m 52s
Julia min - ubuntu-latest - x64 - push	58s
Julia lts - ubuntu-latest - default - push	1m 10s
Julia 1 - ubuntu-latest - x86 - push	4m 15s
Julia 1 - windows-latest - x86 - push	4m 43s
Julia 1 - macos-latest - default - push	2m 38s
Julia lts - macos-latest - default - push	1m 10s
Julia 1 - windows-latest - default - push	4m 7s
Julia lts - windows-latest - x86 - push	2m 11s
Julia 1 - ubuntu-latest - default - push	3m 34s
Julia lts - ubuntu-latest - x86 - push	1m 29s
	30m 32s

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