title: Marker's descriptions do not show up in Mapbox-js
body: <p>I have a dataset, created in mapbox from an original GEOJson file, and later associated to a tileset (aslo in MapBox Studio). It was parsed fine, and I could inspect it in Studio>Dataset, all properties were parsed.</p>
  
  <p>This tileset is then used as a layer on a stylep; the points are displayed, but the point's descriptions are not displayed when using MapBox-gl-js.</p>
  
  <p>What do I have to do to display those descriptions when clicking on a waypoint?</p>
  
  <p>note: Adding them by hand when creating the map isn't my preferred solution. Can this be done transparently from the original dataset saved on mapbox servers?</p>