Doc: update orca-in-5-mins prediction. (#6554)
Doc: update orca-in-5-mins prediction. (#6554)

* fix: update orca-in-5-mins dataset volume.

* fix: update predict stage.
yangw1234/BigDL,intel-analytics/BigDL,yangw1234/BigDL,intel-analytics/BigDL,yangw1234/BigDL,yangw1234/BigDL,intel-analytics/BigDL,intel-analytics/BigDL