Update tree-preservation-order.md

updated point field text

application/templates/pages/guidance/specifications/tree-preservation-order.md

@@ -227,7 +227,11 @@ This will be the title of the page hosting data about this tree preservation ord
 
 The approximate location of the centre of the tree.
 
-You must provide a point or geometry for each tree. You may provide both.
+You must provide a point or geometry for each tree. You may provide both. The point must be in the WGS84 coordinate reference system. If you’re providing point in a CSV, geometry should be in well-known text (WKT). 
+
+Example: `POINT (-0.681152 52.762892)` 
+
+If you’re providing point in a GeoJSON, GML or Geopackage, use the associated geometry format.
 
 ### tree-preservation-order