Move comment about `system.stateVersion` out of attrset `nix`, as it has nothing to do with the `nix.*` options, but belongs with the `system.stateVersion` option below (after) attrset `nix`.
(This is also where this comment originally was, until it was moved in [47129554e4](47129554e4).)
Reviewed-on: #34
Reviewed-by: Skyler Grey <minion@clicks.codes>
Co-authored-by: Raphael Borun Das Gupta <git@raphael.dasgupta.ch>
Co-committed-by: Raphael Borun Das Gupta <git@raphael.dasgupta.ch>
Raphael Das Gupta