`N_PER_DECADE` Doxygen documentation unclear

[landinjm]

It is unclear that the N_PER_DECADE refers to equal spaced outputs within each decade, where each decade is a power of 10.

Also, we don't explicitly say that the number of outputs applied to each decade.

For example, number of outputs = 10 and total increments = 1000 would give something like this for the output list:
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 20, 30, 40, 50, 60, 70, 80, 90, 100