Fix `next` in types of transformer signature

[wooorm]

Initial checklist

• [x] I read the support docs
• [x] I read the contributing guide
• [x] I agree to follow the code of conduct
• [x] I searched issues and couldn’t find anything (or linked relevant results below)
• [x] If applicable, I’ve added docs and tests

Description of changes

• next can also be called w/o parameters, to just continue on
• next returns void (return next() is fine in a transformer)

[codecov-commenter]

Codecov Report

Merging #149 (417ad96) into main (b8fe5ec) will not change coverage. The diff coverage is n/a.

@@            Coverage Diff            @@
##              main      #149   +/-   ##
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  Coverage   100.00%   100.00%           
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  Files            1         1           
  Lines          452       452           
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  Hits           452       452           

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[github-actions[bot]]

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