Correct the documentation to reflect the fact that BUS_DMA_NOCACHE is a flag to bus_dmamem_alloc() rather than bus_dmamap_load();
Correct the documentation to reflect the fact that BUS_DMA_NOCACHE is a
flag to bus_dmamem_alloc() rather than bus_dmamap_load();

Discussed with:	kib
MFC after:	3 days

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