iirdes: fix number of zeroes in the docs
// end of the array.
// _n : filter order
// _ep : epsilon, related to stop-band ripple
-// _za : output analog zeros [length: floor(_n/2)]
+// _za : output analog zeros [length: 2*floor(_n/2)]
// _pa : output analog poles [length: _n]
// _ka : output analog gain
int cheby2_azpkf(unsigned int _n,
