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DSP_iir function clarification

In SPRUEB8B.PDF page 4-52,

it shows the function DSP_iir.  The title of the page says "IIR With 5 Coefficients", but the function takes a parameter, nh, which is defined as the number of coefficients.  Under 'Special Requirements,' it says 'nh must be a multiple of 8 and greater than or equal to 8.' -- So do I just ignore the '5 Coefficients' reference all together?

 

I also can't seem to find an equivalent function that takes multiple data points at once for an input, like DSP_sp_iir().  Is this typically called iteratively for each point in a data set?

Thanks.