doc: Update more docstrings to have one sentence summary as first line. Reviewed optimization, polynomial, signal script directories. * scripts/optimization/fminbnd.m, scripts/optimization/fminsearch.m, scripts/optimization/fminunc.m, scripts/optimization/fsolve.m, scripts/optimization/fzero.m, scripts/optimization/glpk.m, scripts/optimization/lsqnonneg.m, scripts/optimization/pqpnonneg.m, scripts/optimization/qp.m, scripts/optimization/sqp.m, scripts/polynomial/compan.m, scripts/polynomial/mkpp.m, scripts/polynomial/mpoles.m, scripts/polynomial/pchip.m, scripts/polynomial/poly.m, scripts/polynomial/polyaffine.m, scripts/polynomial/polyder.m, scripts/polynomial/polyeig.m, scripts/polynomial/polyfit.m, scripts/polynomial/polygcd.m, scripts/polynomial/polyint.m, scripts/polynomial/polyout.m, scripts/polynomial/polyval.m, scripts/polynomial/ppder.m, scripts/polynomial/ppint.m, scripts/polynomial/ppjumps.m, scripts/polynomial/ppval.m, scripts/polynomial/residue.m, scripts/polynomial/roots.m, scripts/polynomial/spline.m, scripts/polynomial/splinefit.m, scripts/polynomial/unmkpp.m, scripts/signal/arch_fit.m, scripts/signal/arch_rnd.m, scripts/signal/arma_rnd.m, scripts/signal/autoreg_matrix.m, scripts/signal/bartlett.m, scripts/signal/blackman.m, scripts/signal/detrend.m, scripts/signal/diffpara.m, scripts/signal/durbinlevinson.m, scripts/signal/fftconv.m, scripts/signal/fftfilt.m, scripts/signal/fftshift.m, scripts/signal/filter2.m, scripts/signal/freqz.m, scripts/signal/hamming.m, scripts/signal/hanning.m, scripts/signal/hurst.m, scripts/signal/ifftshift.m, scripts/signal/periodogram.m, scripts/signal/sinc.m, scripts/signal/sinetone.m, scripts/signal/sinewave.m, scripts/signal/spectral_adf.m, scripts/signal/spectral_xdf.m, scripts/signal/spencer.m, scripts/signal/stft.m, scripts/signal/synthesis.m, scripts/signal/unwrap.m, scripts/signal/yulewalker.m: Update more docstrings to have one sentence summary as first line.

--- a/scripts/polynomial/mpoles.m	Mon May 04 14:22:02 2015 -0700
+++ b/scripts/polynomial/mpoles.m	Mon May 04 21:50:57 2015 -0700
@@ -20,17 +20,17 @@
 ## @deftypefn  {Function File} {[@var{multp}, @var{idxp}] =} mpoles (@var{p})
 ## @deftypefnx {Function File} {[@var{multp}, @var{idxp}] =} mpoles (@var{p}, @var{tol})
 ## @deftypefnx {Function File} {[@var{multp}, @var{idxp}] =} mpoles (@var{p}, @var{tol}, @var{reorder})
-## Identify unique poles in @var{p} and their associated multiplicity.  The
-## output is ordered from largest pole to smallest pole.
+## Identify unique poles in @var{p} and their associated multiplicity.
 ##
-## If the relative difference of two poles is less than @var{tol} then
-## they are considered to be multiples.  The default value for @var{tol}
-## is 0.001.
+## The output is ordered from largest pole to smallest pole.
+##
+## If the relative difference of two poles is less than @var{tol} then they are
+## considered to be multiples.  The default value for @var{tol} is 0.001.
 ##
 ## If the optional parameter @var{reorder} is zero, poles are not sorted.
 ##
-## The output @var{multp} is a vector specifying the multiplicity of the
-## poles.  @code{@var{multp}(n)} refers to the multiplicity of the Nth pole
+## The output @var{multp} is a vector specifying the multiplicity of the poles.
+## @code{@var{multp}(n)} refers to the multiplicity of the Nth pole
 ## @code{@var{p}(@var{idxp}(n))}.
 ##
 ## For example: