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abc.rst: Clarify larger-but-slower

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docs/source/using_yosys/synthesis/abc.rst
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@ -176,5 +176,6 @@ implemented as whiteboxes too.
Boxes are arguably the biggest advantage that ABC9 has over ABC: by being aware
of carry chains and DSPs, it avoids optimising for a path that isn't the actual
critical path, while the generally-longer paths result in ABC9 being able to
reduce design area by mapping other logic to smaller-but-slower cells.
reduce design area by mapping other logic to slower cells with greater logic
density.