improve documentation
improve documentation

cvetinahantova/node-svm,vasopikof/node-svm,vasopikof/node-svm,nicolaspanel/node-svm,vasopikof/node-svm,nicolaspanel/node-svm,cvetinahantova/node-svm,vasopikof/node-svm,nicolaspanel/node-svm,nicolaspanel/node-svm,cvetinahantova/node-svm,cvetinahantova/node-svm