Update "GHC differences to the FFI Chapter" in user guide.
The old entry had a heavy focus on how things had been. Which is not what I generally look for in a user guide. I also added a small section on behaviour of nested safe ffi calls. [skip-ci]
The old entry had a heavy focus on how things had been. Which is not what I generally look for in a user guide. I also added a small section on behaviour of nested safe ffi calls. [skip-ci]
mentioned in merge request !2800 (closed)
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