Update loading dock fields (#1043)

data/deprecated.json

@@ -550,6 +550,10 @@
     "old": {"disabled_spaces":"*"},
     "replace": {"capacity:disabled": "$1"}
   },
+  {
+    "old": {"door": "loadingdock"},
+    "replace": {"amenity": "loading_dock"}
+  },
   {
     "old": {"drinkable": "*"},
     "replace": {"drinking_water": "$1"}