A list of reasons why DMA-BUFs have to be treated specially. This
should make it clearer why mmaping DMA-BUFs should be avoided and hint
clients on how treat them correctly
Co-authored-by: columbarius <co1umbarius@protonmail.com>
Describing different behaviour for modifier-less and modifier-aware case
and how a EnumFormat with modifier should be fixated. Also adding a Note
about `SPA_PARAM_BUFFERS_blocks`, which is important for multiplane
DMA-BUFS.