Docs: Update geo-distance-range-filter.asciidoc

missing comma

Closes #10957

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

@@ -13,7 +13,7 @@ Filters documents that exists within a range from a specific point:
         "filter" : {
             "geo_distance_range" : {
                 "from" : "200km",
-                "to" : "400km"
+                "to" : "400km",
                 "pin.location" : {
                     "lat" : 40,
                     "lon" : -70