[skip travis] Update NorvigSweetingApproach and ViveknSentimentApproach in docs
[skip travis] Update NorvigSweetingApproach and ViveknSentimentApproach in docs

JohnSnowLabs/spark-nlp,JohnSnowLabs/spark-nlp,JohnSnowLabs/spark-nlp,JohnSnowLabs/spark-nlp