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docs: correct FIR interpolator initialization return status - #347

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SherTheCoder:docs/fix-fir-interpolate-status
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docs: correct FIR interpolator initialization return status#347
SherTheCoder wants to merge 2 commits into
ARM-software:mainfrom
SherTheCoder:docs/fix-fir-interpolate-status

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The Doxygen return-value comments for the F32, Q15, and Q31 FIR interpolator initialization functions identify ARM_MATH_ARGUMENT_ERROR as the result when numTaps is not divisible by the interpolation factor L.

All three implementations actually return ARM_MATH_LENGTH_ERROR for this condition.

This PR corrects the three comments to match the existing behavior.

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