Remove link to Cartesian CRSs (#1016)

Author: JPryce-Aklundh

modules/ROOT/pages/values-and-types/spatial.adoc

@@ -95,10 +95,10 @@ RETURN toInteger(point.distance(p1, p2)/1000) AS km
 
 Two Cartesian Coordinate Reference Systems (CRS) are supported, modeling points in euclidean space:
 
-* link:https://spatialreference.org/ref/sr-org/7203/[Cartesian 2D]
+* *Cartesian 2D*
  ** A 2D point in the _Cartesian_ CRS is specified with a map containing `x` and `y` coordinate values
  ** Specifying this CRS can be done using either the name 'cartesian' or the SRID 7203 as described in xref::functions/spatial.adoc#functions-point-cartesian-2d[point() - Cartesian 2D]
-* link:https://spatialreference.org/ref/sr-org/9157/[Cartesian 3D]
+* *Cartesian 3D*
  ** A 3D point in the _Cartesian_ CRS is specified with a map containing `x`, `y` and `z` coordinate values
  ** Specifying this CRS can be done using either the name 'cartesian-3d' or the SRID 9157 as described in xref::functions/spatial.adoc#functions-point-cartesian-3d[point() - Cartesian 3D)]