A better place to look would be here – but even then, I note the description is pretty vague… We should definitely fix that.
Thankfully, it’s a pretty simple format. Each row corresponds to a different shell (in order of increasing b-value), and for each row, the values correspond to the even, m=0 (axially symmetric) SH coefficients of the expected DW signal, starting from l=0, l=2, …, l=10 (by default). That’s pretty much all there is to it…