Comment on StgArrWords vs StgArrBytes
Comment on StgArrWords vs StgArrBytes

See #8552

Signed-off-by: Arash Rouhani <54a45c2e63e48cb853b660b200c77f0c90aa7f90@student.chalmers.se>
Reviewed-by: Austin Seipp <7ea35d812706d9213868749011af1ed4fa2f6aa0@well-typed.com>

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