Add documentation for Spearmans' Coefficient
Add documentation for Spearmans' Coefficient

DOC: Add spearmancoeff ties, rank, deviation notes to vector.md

Reviewed-By: James Gibson <d6a1591d1ed18efa7606bbd623be6f329ff2561f@gmail.com>

NorthDecoder/jstat,NorthDecoder/jstat,jstat/jstat,jstat/jstat