Rename some roadmap labels (#467)

Author: nyurik

src/pages/roadmap/index.astro

@@ -22,12 +22,12 @@ const projectTabs = [
   },
   {
     id: "maplibre-tiles",
-    label: "MapLibre Tiles",
+    label: "MapLibre Tile Format",
     description: "Evolution of the MapLibre Tiles specification and tooling.",
   },
   {
     id: "martin",
-    label: "Martin",
+    label: "Martin Tile Server",
     description: "Planned work for the Martin tile server.",
   },
 ];