doc: Update documentation of sparse functions including seealso links. * data.cc (Fall, Fany): Use non-zero instead of nonzero. * data.cc (Fnnz, Fnzmax, Ffull): Rewrite docstrings, include more seealso links. * sparse.cc (Fsparse): Rewrite docstring to include example of "sum" behavior and "unique" behavior. Add more seealso links. * sparse.cc (Fspalloc): Rewrite docstring, include more seealso links. * spparms.cc (Fspparms): Add seealso links. * amd.cc (Famd): Use nonzero instead of "non zero". * nonzeros.m: Add seealso links. * spaugment.m: Rewrite docstring, include more seealso links. * spconvert.m: Rewrite docstring, include more seealso links. * speye.m: Rewrite docstring, include more seealso links. * spones.m: Add seealso links. * sprand.m: Rewrite docstring, include more seealso links. * sprandn.m: Rewrite docstring, include more seealso links. * sprandsym.m: Rewrite docstring, include more seealso links. * spy.m: Rewrite docstring, include more seealso links.

--- a/scripts/sparse/nonzeros.m
+++ b/scripts/sparse/nonzeros.m
@@ -19,6 +19,7 @@
 ## -*- texinfo -*-
 ## @deftypefn {Function File} {} nonzeros (@var{s})
 ## Return a vector of the non-zero values of the sparse matrix @var{s}.
+## @seealso{find, nnz}
 ## @end deftypefn
 
 function t = nonzeros (s)