Improve DMA CHAIN_TO docs #57
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This is in response to issue #56.
Note that the documentation that this is replacing states precisely the behaviour that the PAC exhibits, so this isn't really "fixing" the documentation as much as trying to spell it out a bit more clearly.
https://docs.rs/rp2040-pac/latest/rp2040_pac/dma/ch/ch_al2_ctrl/struct.W.html#method.chain_to