Add description for ST_Area
Add description and images for ST_Boundary
Update images for ST_Boundary
Add description and images for ST_Centroid
Add description ST_Dimension
Add description and images for ST_Distance
Update description for ST_Centroid
Update description for ST_Dimension
Add description and images for ST_Distance
Add description and image for ST_EndPoint
Update description for ST_EndPoint
Add description fro ST_Envelope
Update description and add images for ST_Envelope
Add description and images for ST_ExteriorRing
Update and add a include for ST_Boundary
Update link for ST_Boundary
Update example for ST_Boundary
Update description for ST_EndPoint
Update example comparison for ST_Envelope
Update includes for ST_Envelope