docs(drone-airspace): correct the share token, voice support and coverage

The changelog fragment named share-link token 6 (sea marks); the layer
reserves 8. CURRENT-STATE said voice could toggle and query the layer and
listed it among the analyst record sources, but it is in VOICE_OFF_LAYERS.
Say voice is off for now, and that the layer covers FAA prohibited and
restricted special-use airspace only, not the UAS Facility Map / LAANC grids
or TFRs. A test pins these claims to the token ledger and the voice manifest.

scripts/format-scope.json

@@ -413,6 +413,7 @@
   "src/layers/droneAirspace/source.test.mjs",
   "src/layers/droneAirspace/cards.test.mjs",
   "src/layers/droneAirspace/ownership.test.mjs",
+  "src/layers/droneAirspace/docs.test.mjs",
   "src/data/firmsHeatmap.js",
   "src/data/fireAnchors.js",
   "src/layers/firms/anchors.js",