Daniel Schaefer 43650115e3 nixos/documentation: Correct use of lib.optional ...

lib.optional returns a singleton or an empty list. Therefore the
argument does not need to be wrapped in a list.
An alternative patch could have used lib.optionals but seems like no
more elements are going to be added to the optional list.

2018-05-05 15:55:53 +07:00

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