Update reference.html

Author: bdcoder2

v180/reference.html

@@ -929,7 +929,7 @@ <h3>Public Methods</h3>
          <a id="c1_pubmeth_grid_point_bounds"></a>
          <div class="method">
             <div class="method_name">
-               grid_point_bounds( tile_idx: null, grid_point_idx: number ): <a href="https://developers.google.com/maps/documentation/javascript/reference/coordinates?hl=en#LatLngBounds" target="_blank">google.maps.LatLngBounds</a>
+               grid_point_bounds( tile_idx: number, grid_point_idx: number ): <a href="https://developers.google.com/maps/documentation/javascript/reference/coordinates?hl=en#LatLngBounds" target="_blank">google.maps.LatLngBounds</a>
             </div>
             <div class="method_desc">
                <p>
@@ -2466,4 +2466,4 @@ <h2>Type: map_marker</h2>
       Last updated on: 26-Jun-2024
    </footer>
 </body>
-</html>
+</html>