Updated quantized mesh description

Changed `a simple multi-resolution quadtree pyramid of heightmaps` to `a simple multi-resolution quadtree pyramid of meshes`
CesiumGS · Jun 9, 2021 · 9714fc1 · 9714fc1
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 Have a question? Discuss the quantized-mesh specification on the [Cesium community forum](https://community.cesium.com/).
 
-A terrain tileset in quantized-mesh-1.0 format is a simple multi-resolution quadtree pyramid of heightmaps. All tiles have the extension .terrain. So, if the Tiles URL for a tileset is:
+A terrain tileset in quantized-mesh-1.0 format is a simple multi-resolution quadtree pyramid of meshes. All tiles have the extension .terrain. So, if the Tiles URL for a tileset is:
 
 ```
 http://example.com/tiles