Wrong link in the manual in the deriving strategies section
Summary
In the deriving strategies section of the ghc manual, there exists a hyperlink to https://ghc.gitlab.haskell.org/ghc/doc/users_guide/exts/deriving_strategies.html#deriving-extra, which does not appear to refer to anything on that page.
I strongly suspect that this is trying to actually refer to https://ghc.gitlab.haskell.org/ghc/doc/users_guide/exts/deriving_extra.html, and it was valid while these were still simply sections, but is now broken, because they are separate pages now.
https://ghc.gitlab.haskell.org/ghc/doc/users_guide/exts/deriving_strategies.html#deriving-extra
Proposed improvements or changes
Link to https://ghc.gitlab.haskell.org/ghc/doc/users_guide/exts/deriving_extra.html instead