Update gcn/notices/core/Localization.schema.json

Co-authored-by: Leo Singer <[email protected]>

gcn/notices/core/Localization.schema.json

@@ -26,7 +26,7 @@
           },
           "minItems": 3,
           "maxItems": 3,
-          "description": "Array values: position_error_a, position_error_b, position_error_pa. These represent the length of the semi-major axis, semi-minor axis, and astronomical position angle (measured from North through East) of the major axis of the uncertainty ellipse [deg]."
+          "description": "An array of up to three values that describe the localization region as an ellipse: length of the semi-major axis, length of the semi-minor axis (default is the same as the semi-major axis), and astronomical position angle of the semi-major axis (measured from North through East, default is zero)."
         }
       ]
     },