[mt] update docs for reduceverts

src/algorithmtypes.jl

@@ -62,7 +62,7 @@ making this algorithm useful for topological analysis.
 
 - `iso` specifies the iso level to use for surface extraction.
 - `eps` is the tolerence around a voxel corner to ensure manifold mesh generation.
-- `reduceverts` reserved for future use.
+- `reduceverts` (default: true) if false, vertices will not be unique and have repeated face references.
 - `insidepositive` (default: false) set true if the sign convention inside the surface is positive, common for NRRD and DICOM data
 """
 struct MarchingTetrahedra{T} <: AbstractMeshingAlgorithm