improve the documentation of hilbertSeries:

R = kk[a..d]
phi = map(kk[s,t],R,{s^4, s^3*t, s*t^3, t^4})
I = ker phi
I = monomialCurveIdeal(R,{1,3,4})
dim I
codim I
degree I
hilbertPolynomial(R/I)
hilbertPolynomial(R/I, Projective => false)
hilbertPolynomial(R/I, Projective => true)
hilbertSeries (R/I)
reduceHilbert hilbertSeries (R/I)
-- It's possible to manipulate the numerator and denominator of this
-- expression; see
viewHelp hilbertSeries 

{*
 This is NOT in the documentation for hilbertSeries yet. Need to 
 add references to
"numerator", value denominator, etc.
*}
