Fix comment about needing admin.osc.bz2 (#1034)

PLANET.md

@@ -22,6 +22,10 @@ First decide where to get the `planet.osm.pbf` file:
   osmium apply-changes daylight.osm.pbf admin.osc.bz2 <buildings.osc.bz2, ...> -o everything.osm.pbf
   osmium renumber everything.osm.pbf -o planet.osm.pbf
   ```
+
+  NOTE: you need at least `admin.osc.bz2` for the `boundary` layer to show. This takes about 2.5 hours and needs as much
+  RAM as the `planet.osm.pbf` size.
+
 - If you would like to update your `planet.osm.pbf` file to the latest changes from OpenStreetMap, you can
   use [pyosmium-up-to-date](https://docs.osmcode.org/pyosmium/latest/user_manual/10-Replication-Tools/#updating-a-planet-or-extract):
 
@@ -29,9 +33,6 @@ First decide where to get the `planet.osm.pbf` file:
   pyosmium-up-to-date --size 20000 -v planet.osm.pbf
   ```
 
-  NOTE: you need at least `admin.osc.bz2` for the `boundary` layer to show. This takes about 2.5 hours and needs as much
-  RAM as the `planet.osm.pbf` size.
-
 ### 2) Run Planetiler
 
 Download the [latest release](https://github.com/onthegomap/planetiler/releases/latest) of `planetiler.jar`.