Fixed bugs in example jupyter notebook
Fixed bugs in example jupyter notebook

* added missing import random
* Minor copy  editing and markdown formatting of comment cells
* fixed broken path to example csv file
* removed redundant print functions for nicer pandas table outputs
* fixed incorrect column names for sample data on type changing and predictedcol
* fixed typo in random_forest call
HealthCatalystSLC/healthcareai-py,jpo/healthcareai-py,jpo/healthcareai-py,HealthCatalyst/healthcareai-py,mxlei01/healthcareai-py,mxlei01/healthcareai-py,HealthCatalyst/healthcareai-py,HealthCatalystSLC/healthcareai-py