Fix sample table-label for tutorial nightly build (#1991)
Fix sample table-label for tutorial nightly build (#1991)

* fix

* add feature=features[0]

* update docs

intel-analytics/BigDL,intel-analytics/BigDL,yangw1234/BigDL,intel-analytics/BigDL,yangw1234/BigDL,yangw1234/BigDL,yangw1234/BigDL,intel-analytics/BigDL