Clarify `max_point_buffer` (#1046)

planetiler-core/src/main/java/com/onthegomap/planetiler/config/PlanetilerConfig.java

@@ -210,7 +210,7 @@ public record PlanetilerConfig(
       arguments.file("tile_weights", "tsv.gz file with columns z,x,y,loads to generate weighted average tile size stat",
         tmpDir.resolveSibling("tile_weights.tsv.gz")),
       arguments.getDouble("max_point_buffer",
-        "Max tile pixels to include points outside tile bounds. Set to a lower value to reduce tile size for " +
+        "Additional global limit for the max tile pixels to include points outside tile bounds of all layers. Set to a lower value to reduce tile size for " +
           "clients that handle label collisions across tiles (most web and native clients). NOTE: Do not reduce if you need to support " +
           "raster tile rendering",
         Double.POSITIVE_INFINITY),