message: docs: correct incorrect hyperlink
  Current hyperlink is going to
diff: @@ -76,7 +76,7 @@ SUPERSET_WEBSERVER_TIMEOUT = 60
  ### Why is the map not visible in the geospatial visualization?
  -You need to register a free account at [Mapbox.com](www.mapbox.com), obtain an API key, and add it
  +You need to register a free account at [Mapbox.com](https://www.mapbox.com), obtain an API key, and add it
  to **superset_config.py** at the key MAPBOX_API_KEY:
  ```
  