Update 62_Geo_distance_agg.asciidoc (elastic#546)

Query Breaking due to comma in gwo_bounding_box lat value. I added point instead of comma in geo_bounding_box lat value.

Author: sumit-gupta-sgt

330_Geo_aggs/62_Geo_distance_agg.asciidoc

@@ -21,7 +21,7 @@ GET /attractions/restaurant/_search
         "geo_bounding_box": {
           "location": { <2>
             "top_left": {
-              "lat":  40,8,
+              "lat":  40.8,
               "lon": -74.1
             },
             "bottom_right": {