`part3_finding_point_of_interests.ipynb` guide fixed

[tarunkukreja003]

part3_finding_point_of_interests.ipynb guide fixed.

Major changes: - changing from gis.map() to Map() - adding spatialReference to location for the Point geometry to be drawn on the Map - removed the section Example of finding restaurants within a polygon drawn on map since on_draw_end() function doesn't exist anymore - added updated map screenshots