fix typo

The output in the Developer Center is not being properly rendered just because of a typo in the headline format.

docs/guides/02-general-concepts.md

@@ -37,10 +37,10 @@ All the endpoints, which might be accessed using a web browser, add CORS headers
 
  **Note:** By default, CARTO uses vector graphics for map rendering. Please [contact us](mailto:support@carto.com) if you need raster rendering enabled as part of your requirements.
 
- ### Mapbox Vector Tiles (MVT)
+### Mapbox Vector Tiles (MVT)
 
  [Mapbox Vector Tiles (MVT)](https://www.mapbox.com/vector-tiles/specification/) are map tiles that store geographic vector data on the client-side. Browser performance is fast since you can pan and zoom without having to query the server.
 
  CARTO uses a Web Graphics Library (WebGL) to process MVT files. This is useful since WebGL's are compatible with most web browsers, include support for multiple client-side mapping engines, and do not require additional information from the server; which makes it more efficient for rendering map tiles.
 
- **Tip:** You can process MVT files with the [`ST_AsMVT` PostGIS function](https://postgis.net/docs/manual-dev/ST_AsMVT.html) with the [Maps API Windshaft renderer](https://github.com/CartoDB/Windshaft/blob/1000x/lib/windshaft/renderers/pg_mvt/renderer.js).
+ **Tip:** You can process MVT files with the [`ST_AsMVT` PostGIS function](https://postgis.net/docs/manual-dev/ST_AsMVT.html) with the [Maps API Windshaft renderer](https://github.com/CartoDB/Windshaft/blob/1000x/lib/windshaft/renderers/pg_mvt/renderer.js).