GeoJSON is lon,lat

Although emphasized in the text, the example was backwards.

Closes #7843

docs/reference/query-dsl/filters/geo-distance-filter.asciidoc

@@ -84,7 +84,7 @@ conform with http://geojson.org/[GeoJSON].
         "filter" : {
             "geo_distance" : {
                 "distance" : "12km",
-                "pin.location" : [40, -70]
+                "pin.location" : [-70, 40]
             }
         }
     }