When you click on https://hackage.haskell.org/package/pretty-1.1.3.6/docs/Text-PrettyPrint-Annotated.html#v:HughesPJ you are not getting to this module but stay in the Annotated module.
The source is here:
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-- This module should be used as opposed to the |
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-- 'Text.PrettyPrint.Annotated.HughesPJ' module. Both are equivalent though as |