ARROW-8320: [Format] Add clarification to CDataInterface.rst regarding memory alignment of buffers #6840
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This recommends at least a minimum alignment based on the type of data the buffer contains. For example, if the buffer contains
int32_tdata, then a minimum of 4-byte alignment is recommended.If an Arrow implementation finds unaligned memory burdensome due to aliasing issues or undefined behavior, this also clarifies that they are not expected to support it.